SSH algorithm

Similar Questions

• broken ssh?

  I've updated my Mac OS to 10.11 of 10.9, and now I find that I am unable to ssh using the SSH Secure Shell on a PC application. When I try to do and tell it to authenticate with a password, it is back with "the server replied"Algorithm negotiation failed"" and a few words about the failure of key exchange. I did not look at the keys! Using PuTTY, I get just, after he gets my password. While it is with SSH Secure Shell? This used to work properly. I'll just dump SSH Secure Shell on my PC and use PuTTY, but I would like to know why I have to do. What is different about ssh in El Capitan?

  You just need to use a newer version of secure shell.

  Recent versions of ssh have the older is not-that-secure algorithms removed, because they are simply not sure more.

  Ssh program you are trying to use is just outdated, that on the mac is more current, that's all.

• After the installation of the VMware-VMvisor-Installer-6.0.0.update02-3620759.x86_64-Dell_Customized-A01 ssh service fails

  Hello

  yesterday, I upgraded a few of my guests ESXi to VMware-VMvisor-Installer-6.0.0.update02-3620759.x86_64-Dell_Customized-A01.iso

  But after the restart, everything works well except the SSH daemon.

  I can not connect via SSH to host more. In the settings, everything seems well, ssh daemon is running, and firewall ports are open.

  Something wrong with this version?

  OK, fixed. It was a problem with an older version of PuTTY.

  In the log file, you will find something like:

  auth.log:2016 - 05-07 T 12: 58:09Z sshd [164893]: error: Hm, kex protocol error: type 30 seq 1

  If the old version of PuTTY had the bad protocol settings. You can change it in Putty SSH parameters - KEX to change the order of the algorithm and put "Diffie-Hellman group Exchange" at the bottom.

  Or better yet, download a newer version of PuTTY. It is fixed in newer versions

• is it possible to connect with SSH from router to router?

  is it possible to connect with SSH (1.0 or 2.0) to a CISCO-router/Switch to another CISCO-router/Switch?

  I think that an SSH connection to a router/switch is no longer possible to a women (Windows/Linux/Unix)

  is it not?

  I don't know if Cisco Compatible SSH 2.0, but there IOS - s that support ssh 1.0 and you can connect with ssh 1.0 from a cisco device (if it supports) to any device with

  Router # ssh?

  Select encryption algorithm - c

  -l Log in using that username

  options to specify o

  p connect to this port

  Address WORD IP or hostname of a remote system

  Router # ssh x.x.x.x

• Disable SSH on Cisco routers/switches CBC encryption

  Hello

  Our customer ordered PenTest, and as a feedback, they got recommendation "disable SSH Mode CBC Ciphers, and don't allow that CTR ciphers ' and 'Disable weak SSH MD5 and algorithms MAC 96 bits' on their switches Cisco 4506-E with CIsco IOS 15.0

  I went through Cisco documentation that I could find, also tried to find commands on the switch itself, but I found no way to manipulate these SSH options. (SSH v2 only is already set up)

  Is it possible to do this on Cisco IOS? If this is not the case, what are my options?

  You can use an external server for authentication. But that will not change anything in the encryption.

  RAY will be fine for authentication, if you are also looking strong authorization, you should look into GANYMEDE +.

  Back to you initial problem:

  Some long time there was a similar problem with a client and it resolved in the following way:

  1. All routers and switches had a class of only two Linux servers access to access devices through SSH.
  2. The SSH server was accessed by admins and used as a jumping point to access the routers/switches
  3. Linux servers had a put to update the ssh-server config to allow only the strong crypto to Admins and also check the administrative work.

  With this, there was strong crypto by the admin-workstations to linux server and pretty weak crypto of the Linux for routers switches (which was at the time-3900XL-2950). But as the linux-boxes have been placed in the management network, all on the risk has been reduced.

• SSH keys are protected by a password that is supported for SSH tunnels?

  Using SQL Developer 4.1 I get an error if I try to connect a SSH Tunnel using a private key that is protected by a password.

  com.jcraft.jsch.JSchException: privatekey: aes256-cbc is not available [B@2ef5d584
    at com.jcraft.jsch.KeyPair.load(KeyPair.java:654)
    at oracle.dbtools.raptor.ssh.RaptorFileIdentity.createIdentity(RaptorFileIdentity.java:26)
    at oracle.dbtools.raptor.ssh.RaptorIdentityRepository.getRepository(RaptorIdentityRepository.java:32)
  
  

  

  I don't see anywhere to enter the password; is it supported?

  Thank you.

  As Jeff said, pass phrases are supported. While your keyfile may require a password, is not what we shifted upward.

  Instead, the problem is that the developer SQL does not support aes256-cbc. We don't specify as an algorithm of encryption supported by trying to open the SSH connection. If the key cannot be used. It is a bug, please add support for additional cryptographic algorithms beyond the default value OF THE used by ssh-keygen and other key generating default tools.

  In the meantime, if you have a control on the generation of keys, you can try using a different encryption algorithm but preserving the password requirement. The only solution would be to create the tunnel outside the SQL Developer and then manually create connections that run through the tunnel.

  -John

  SQL development team

• Failure of the negotiations of the algorithm

  I have a workflow in orchestrator I ran before that traverses the volumes and running the commands cancel the MAPPING.  It worked before, but what I've read.  6 ESXi update 2, put ssh to update and I guess who broke my job to run.

  Whenever I run my workflow I get an error: cannot run command InternalError: negotiation of the algorithm fail error.

  I found a few VMWare KB on this, but it was for an older version of the vCO.  I have tried adding this to my session...

  session.setInfo("cipher.s2c", "aes128-cbc,aes256-cbc,3des-cbc,blowfish-cbc,aes128-ctr,aes192-ctr,aes256-ctr");


  session.setInfo ("cipher.c2s", "aes128-cbc,aes256-cbc,3des-cbc,blowfish-cbc,aes128-ctr,aes192-ctr,aes256-ctr");

  
  

  Still does not work.

  
  

  Any ideas?  I would really appreciate it.
  

  Hello

  You could start tcpdump or Wireshark on the ssh server to see what algorithms are accepted by the server and compare it to the algorithms provided by the ssh client.

  I had the same error, try to connect from vRO 6.0.2 for Ubuntu LTS 16.04 and adding these lines in my sshd_config did:

  KexAlgorithms diffie-hellman-group1-sha1,[email protected],ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group14-sha1
  
  Ciphers 3des-cbc,blowfish-cbc,aes128-cbc,aes128-ctr,aes256-ctr
  

  In fact, the KexAlgorithms did not fit according to Wireshark.

  Best regards

  Thomas

• Sun Solaris 5.10 - SSH 1.1.3 - Not able to connect to the server by ssh - Urgent

  Hello
  I am not able to coonect to a server by using the code below.
  
  If I try the same code on the server to connect it self, it works well. But when I try to connect to another server gives the error below. And I use the IBM Jdk when getting this error. Y at - it a setting to avoid this error.
  
  Error:
  INFO: Add /usr/jdk/instances/jdk1.6.0/jre/lib/ext/sunpkcs11.jar to the CLASSPATH of the extension
  ConfigurationLoader
  November 30, 2010 16:33:12 < clinit > com.sshtools.j2ssh.transport.publickey.SshKeyPairFactory
  INFO: Loading public key algorithms
  Error so that SFTP
  java.util.NoSuchElementException
  at java.util.StringTokenizer.nextToken(StringTokenizer.java:332)
  at java.util.StringTokenizer.nextElement(StringTokenizer.java:390)
  to com.sshtools.j2ssh.transport.AbstractKnownHostsKeyVerification. < init >(Unknown Source)
  to com.sshtools.j2ssh.transport.ConsoleKnownHostsKeyVerification. < init >(Unknown Source)
  at com.sshtools.j2ssh.SshClient.connect (unknown Source)
  at fileTransfer.connectToServer(fileTransfer.java:18)
  at fileTransfer.main(fileTransfer.java:56)
  
  
  
  Code:
  public static boolean connectToServer (String serverIp, int serverPort, String userId, String password)
  {
  SFC SshClient = null;
  try {}
  System.out.println ("inside the Try to like his SFTP");
  ConfigurationLoader.initialize (false);
  System.out.println ("ConfigurationLoader");
  
  SFC = new SshClient();
  SFC. Connect (Ipserver, serverPort);
  System.out.println ("SFC. Connect");
  
  PasswordAuthenticationClient pwd = new PasswordAuthenticationClient();
  
  pwd.setUsername (userId);
  
  pwd.setPassword (password);
  
  int checkAuth = sfc.authenticate (pwd);
  System.out.println ("checkAuth" + checkAuth);
  
  If (checkAuth == 4) {}
  System.out.println ("AuthenticationProtocolState.Complete");
  
  SFTP SftpClient = sfc.openSftpClient ();
  sftp.Quit ();
  SFC. Disconnect();
  }
  on the other
  {
  throw new Exception ("invalid user name or password for the user");
  }
  }
  catch (System.Exception e)
  {
  System.out.println ("Error While SFTP");
  SFC. Disconnect();
  e.getStackTrace ();
  Returns false;
  }
  Returns true;
  }

  Swapped

  Sun Solaris 5.10 - SSH 1.1.3 - Not able to connect to the server by ssh - Urgent

  @O.P.
  Don't, don't.
  In the future, to choose the most appropriate forum and make your post.
  Swap shall be the same as the rude spamming.
  I'm not aware of any web-site-of-value forum that would promote the permutation in its directions on the label.

  ... and for what is "Urgent"?
  This web site is for the end-user community gather and discuss various topics in general conversations. Your time constraints are irrelevant. If you need real support for something, then log a support case and pay for a quick response.

  See the FAQ in the link at the top of the page.

• Can't ssh on Mac OS VPN server

  I can connect to my VPN L2TP server with my iPhone running iOS 10 through my network of data carriers and passed to my home network from Comcast, but everything does not work;

  What works:

  Access default Web site running the macOS Server using its IP address

  Public Web surfing

  I can ping my phone of any system IP address on my network

  What does not (what I tried):

  SSH to any system macOS on my network

  Access screen sharing on any system macOS on my network

  Resolve the local hostname to an IP address

  More information

  my iphone is running iOS 10

  My computers are running macOS Sierra

  I use Mac OS as host VPN server

  I use the client VPN L2TP iOS 10.

  Firewalls in the system is disabled.

  Typical VPN connections, you use the DNS server of your iPhone and not the DNS server of the network corresponding to your server.  In addition, Hello services are only available on the LAN.  So you have no way to resolve names to IP adrdesses for the network, you are VPNing.

  The only easy solution from an iPhone is to make a list of IP addresses and use them to connect instead of host names.  using IPs will work as long as your ISP does not also use the same internal (like 192.168 or 10.0) IP address than the network that you connect to.

• SSH keys no longer work after macOS Sierra Update

  Hello, I have a problem to connect my servers with my previously stored private ssh key in file .ssh with terminal commands or third-party applications. I should mention that I activated the filevault during the upgrade process. I see that my passphases are stored in the keychain, but I need to enter my password every time I want to connect to servers.

  Hello Marshall,

  Try to create a new ssh key. I think Sierra includes updated logic crypto and he doesn't like really old keys.

• remembering ssh passphrases

  Before moving on to the Sierra, the first time I ran a ssh command every day, he would ask for my password and store the key, making it usable by any other ssh process, no matter where I am connected, thanks to the "forwarding agent. That's what I'm used to and is identical to the way things work on my other computer (which runs on Linux).

  After upgrade to Sierra, passphrases my SSH keys are somehow being 'remembers', but no ssh-agent. I am able to ssh from my laptop directly in one of the servers that I managed, without being asked a password, but because the agent does contain all the keys (i.e. "ssh - add - l" returns "the agent has no identity."), I'm not able to ssh from this server to another server, which also makes the 'scp' and 'git' commands do not work until I go back to the laptop itself and run "ssh - add.

  I tried to use "Keychain Access" to find and remove the element containing the password, but no items in any of my files of trousseau (connection, iCloud, System or root system) contain 'ssh' anywhere in their title. I also tried 'ssh - add - d K' and 'ssh - add - d /Users/xxx/.ssh/id_rsa K. Neither the command seems to have no effect, they are not compensation everywhere where passwords are stored.

  The output of "ssh - vvv" Server1 contains the following items:

  debug1: next authentication method: public key

  debug1: offering public key RSA: /Users/xxx/.ssh/id_rsa

  debug3: send_pubkey_test

  debug3: send packets: type 50

  debug2: we sent a publickey packet, wait for reply

  debug3: receive packets: type 60

  debug1: server accepts key: ssh - rsa Bouasla 279 pkalg

  debug2: input_userauth_pk_ok: PS SHA256:m59cRsLlMQHZk1KlO5fJNlaYBhCIyrE3eF4YaX / + q / A

  debug3: sign_and_send_pubkey: SHA256:m59cRsLlMQHZk1KlO5fJNlaYBhCIyrE3eF4YaX RSA / + q / A

  debug3: search for the Query element: {}

  ACCT = "/ Users/xxx/.ssh/id_rsa";

  AGPR = "com.apple.ssh.passphrases";

  class = genp.

  labl = "SSH: /Users/xxx/.ssh/id_rsa";

  nleg = 1;

  'r_Data' = 1;

  Svce = OpenSSH;

  }

  debug2: using Keychain password

  debug3: send packets: type 50

  debug3: receive packets: type 52

  debug1: successful authentication (public key).

  Authenticated to server1 ([192.168.1.209]: 22).

  How can I make ssh NOT remember passwords for my keys?

  Thanks to http://apple.stackexchange.com/questions/253779/macos-10-12-sierra-will-not-forg and my-ssh-keyfile-password , I found that the password is stored in ~/Library/Keychains/{UUID}/keychain-2.db, rather than in the keychain. It is a sqlite3 file and the element containing the sentence can be removed with the following query:

  ~/Library/keychains/*/Keychain-2.DB $ sqlite3

  SQLite > delete from the genp where agrp = 'com.apple.ssh.passphrases';

  SQLite > .q

  $

  The problem is, the next ssh command I type asks for the password and stores it in the same file again.

  How do you prevent ssh from store my passwords at all?

• Mac OS Server - local users on console does not.  The shared access or ssh on account works

  A Mac Mini running Mac OS Server has problems with authenticating the passwords of local users.  Users connect the console of the physical computer running macOS app Sierra and Server 5.2.

  I'm looking for a short solution from scratch user and migrating data to a new installation.

  My hunch is that there is an interaction with the server application.  The other Macs, I managed on the same network fail server and do not have these problems.

  I installed a new version of macOS Sierra and then migrate the old data server on using the migration wizard, but the problem persists.

  The server used to have users on the network, but they are all deleted, and all users are the.

  In application server, the only services running time machine, the caching server and file server.  DNS, DHCP and Open Directory services are disabled in the server application.

  A local user password will work normally when the computer is restarted.  But if the user disconnects, and tries to connect to or use the fast user switching back and forth between accounts, the password is not accepted.  On reboot, it will be accepted.

  In addition to passwords are not accepted, other errors when you try to connect to specific customers include:

  "Your account is not a valid directory.  For more information, contact your system administrator'

  or

  "On behalf of user that you selected is not available."  Check your network connection and try again to the user account.  If you are connected to the network, ask system administrator for assistance. »

  If a network is used to access the data of the user using the user name and password, it works.  Similarly, SSH'ing via the terminal using the username and password works.

  An admin user can change the password back and it usually works for one login.  Then the password is denied if the user disconnects or use the fast user switching.

  Thanks in advance for any help on this embarrassing problem!

  I should clarify: it's the passwords of local users on the Mac who stop working (for the connection or fast user switching), until the Mac restarts.

• Unable to ssh on alternative port

  Mini Mac OS X Server 10.11.6, CommuniGate Pro, no and almost no other stock OS X Server services.

  The server owner recently found on a network that has blocked ports for VPN and SSH connections, so we try to set up the server to allow a SSH tunnel through SOCKS proxy port 443, which is almost always open. (We have no plans on execution of web services via this port on this area.)

  Research indicates that this should be a two-step process: 1) Edit /Library/Server/Web/Config/Proxy/apache_serviceproxy.conf to remove the web listening on ports 80 and 443 ports; (2) edit/etc/ssh/ssh_config for add a SSH listener on port 443. then restart.

  After that, HTTP services are off on 80 and 443, but I can't connect to SSH on port 443. Works very well over 22 yet. Nmapping the server indicates that there is nothing open on port 443. Is there anything else I need to do for this open?

  A user on the stack Exchange responded to this question. Works a charm.

  http://Apple.StackExchange.com/questions/253332/unable-to-SSH-to-OS-x-server-Ove r-replacement-port

• SSH permissions

  I know that this has been done, but I can't find here or elsewhere.

  I just reinstalled my SSH protocols after replacing a hard drive on the server and (data only) restore from a Time Machine backup. I seemed to have to start the SSH process from scratch.

  I'm from the procedure (which I learned here) ctlow.ca/SSH-VPN_MacOSX.html.

  It worked, but when I connect from the client, it just goes through without asking for password. I think that he asked a password the first time, the password private key (?), but he used to ask for it (in a small text box, echo) every time and then the password (?) server in the Terminal itself, not taken over.

  Now, none of those happening.

  So, I found some notes I had made about it and reset the permissions as 700 .ssh folder and files inside like 600, on the server and the client.

  It ends up looking like this:

  ClientComputer: ~ ClientID$ ls - ael .ssh

  Total 24

  drwx - 5 personal ClientID 170 11 Sep 15:24.

  drwxr-x-wx + 24 personal ClientID 816 13 Sep 08:26...

  0: Group: everyone deny delete

  -rw-@ 1 personal ClientID 32 10 February 2012 config

  -rw - 1 1766 11 Sep 15:11 id_rsa personal ClientID

  -rw - 1 818 11 Sep 15:33 known_hosts personal ClientID

  ====

  ServerComputer: ~ ServerID$ ls - ael .ssh

  Total 16

  drwx - 4 personal ServerID 136 11 Sep 15:28.

  drwxr-xr-x @ 25 personal ServerID 850 11 Sep 15:30...

  0: Group: everyone deny delete

  -rw - 1 416 11 Sep 15:28 authorized_keys personal ServerID

  -rw - 1 391 11 Sep 15:26 known_hosts personal ServerID

  I don't think I'm particularly threatened, but I was happy to have to use two passwords to log into the SSH tunnel. No idea why I wonder no password now? (I did specify a passphrase when generating the key.)

  Thank you.

  Charles

  P.S. The customer running 10.9, 10.11 server.

  P.P.S. For the client-user info window showed "shared folder" which I don't know how it got that way and have unchecked the box. I doubt if that is related to my question.

  Hello Charles,

  I'm not sure what you were doing before, but it seems OK now.

  Most of the internet uses the same set of instructions that tell people not to use a password for the private key. It's a hassle to the running ssh-agent and most people struggle enough as it is with ssh. But on OS X, keychain using ssh-agent. Thus, when you provide a password for your private key, the first time you go, you will be asked (via a beautiful Aqua GUI) your password. You can expect that and save it in the keychain, hence, you will never be asked again. Then, if the rest of your ssh stuff is correct, it will pass all by as you describe. It sounds like what is happening now, and that's how it should work.

  If I were to speculate, I think that maybe before you run a custom build of ssh and ssh-agent command line version. This would explain the double Terminal passwords can be made echo and the other not.

• MacOS Sierra not properly to access the Keychain for OpenSSL/SSH passwords

  Hello

  It seems to be a problem in the Sierra of MacOS on the passwords for SSH keys.

  I have my public/private key pair that is enabled for access to some linux servers, so I can't SSH in without inserting my password. After upgrading to Mac OS sierra, it seems that the keychain is no more long-term treatment/store/retrieve passphrases correctly.

  When first tried to open a session in one of my remote servers, asked me for the password, which seemed odd, so I thought that maybe the passwords were lost in the upgrade and changed the password manually by calling "ssh-keygen - f id_rsa Pei." Then I went to log in again, I asked the password and he entered, so I could connect to the server but then, apart from SSH telling me it has stored the password in the keychain, subsequent attempts to connect again always ask me the password.

  debug1: Next authentication method: publickey
  debug1: Offering RSA public key: /Users/xxxxx/.ssh/id_rsa.pub
  debug3: send_pubkey_test
  debug3: send packet: type 50
  debug2: we sent a publickey packet, wait for reply
  debug3: receive packet: type 60
  debug1: Server accepts key: pkalg ssh-rsa blen 535
  debug2: input_userauth_pk_ok: fp SHA256:/xxxxxxxxx/GM
  debug3: sign_and_send_pubkey: RSA SHA256:/xxxxxxxx/GM
  debug3: Search for item with query: {
      acct = "/Users/xxxxx/.ssh/id_rsa.pub";
      agrp = "com.apple.ssh.passphrases";
      class = genp;
      labl = "SSH: /Users/xxxxx/.ssh/id_rsa.pub";
      nleg = 1;
      "r_Data" = 1;
      svce = OpenSSH;
  }
  debug2: Passphrase not found in the keychain. Enter passphrase for key '/Users/xxxxx/.ssh/id_rsa.pub': debug2: no passphrase given, try next key
  debug1: Offering RSA public key: /Users/xxxxx/.ssh/id_rsa
  debug3: send_pubkey_test
  ...
  debug2: storing passphrase in keychain debug3: Search for existing item with query: {
      acct = "/Users/xxxxx/.ssh/id_rsa";
      agrp = "com.apple.ssh.passphrases";
      class = genp;
      labl = "SSH: /Users/xxxxx/.ssh/id_rsa";
      nleg = 1;
      "r_Ref" = 1;
      svce = OpenSSH;
  }
  debug3: Item already exists in the keychain, updating. debug3: send packet: type 50
  debug3: receive packet: type 52
  debug1: Authentication succeeded (publickey).
  

  Note how he is unable to find the password in the keychain (it is out of the attempts of the second and following), then he says it stores the password in the keychain, and then, he considers it and "updated" it. However, next attempt will not find the password in the keychain, so that the process will be repeated "ad nauseam".

  We are not allowed to discuss beta of Mac OS in public forums.

  When you register, you gave instructions for reporating problems.

  Please find this information and use it, so that developers can solve any problems you encounter.