Unable to connect to the remote computer (ORA-12545) DB

Hi all

Need help please, I'm stumped.  I am trying to connect to a database that is located in my work from home.

I'm running into the following question (see the command and the error below):

-------------------------------

ansichart@ansivm:~/src/perl$ sqlplus aspxdba/***@aspxp2

SQL * more: Production of the 11.2.0.3.0 version Thu Jul 18 21:15:09 2013

Copyright (c) 1982, 2011, Oracle.  All rights reserved.

ERROR:

ORA-12545: Connect failed because target host or object does not exist

-------------------------------

Here are my tnsnames.ora file (I have the service_name censorship out for privacy reasons):

-------------------------------

ansichart@ansivm:~/src/perl$ cat $ORACLE_HOME/network/admin/tnsnames.ora

aspxp2 =

(DESCRIPTION =

(ADDRESS_LIST =

(ADDRESS = (PROTOCOL = TCP) (HOST = orarac9-scan)(PORT = 1521))

)

(CONNECT_DATA =

(SERVICE_NAME = *) (UR = A)

)

)

-------------------------------

I checked that I can establish a TCP connection to the DB server on the specified port, using the same information in the file TNSnames.ora (see below):

-------------------------------

ansichart@ansivm:~/src/perl$ nmap - sT Pei 1521 orarac9-scan

from Nmap 5.21 ( http://nmap.org ) to 2013-07-18 20:53 CDT

Scan nmap for orarac9-scan (10.1.13.115) report

Host is (0.0088 s latency).

SERVICE OF THE PORT STATE

1521/tcp open oracle

Nmap done: 1 IP (1 host upward) address scanned in 0.09 seconds

ansichart@ansivm:~/src/perl$

-------------------------------

I have another terminal opens to a server at work and I can connect to the DB with sqlplus very well.  I checked the record for this database on the tnsnames.ora file is the same as it is at work.

In conclusion, I can connect to the database to work, but I can't go home, even if I am using the same connection information and verify that port 1521 is available on this database from home server.  So why can't a DB connection?

Any ideas?

Thank you

Ben

676d3153-d812-4300-9e6a-b1dc87a2ebfe wrote:

ERROR:

ORA-12545: Connect failed because target host or object does not exist

It simply means "Unknown host name." In other words, the hostname used for the connection could not be resolved to an IP address.

I checked that I can establish a TCP connection to the DB server on the specified port, using the same information in the file TNSnames.ora (see below):

You check hostname orarac9-analysis only. You do not check that the hostname provided by the Oracle SCAN earpiece can be resolved by your platform.

That you connect to a listener to SCAN, it will do its magic (balancing/alternate/whatever) and return, the customer asked the name a redirect to your client driver - he tell where to find the service.

If the driver of your client gets a host name and port in return. He then tries to connect to that to establish your Oracle client-server session. If the RAC has been implemented with FCAC's typical host names, your customer will get names like vip1-orarac9 and orarac9-vip2 returned. Probably as FULL domain name too.

This means that your platform must be able to resolve these host names. This isn't. Thus the error.

In the file/etc/hosts of your platform, define the list of hostnames (hostnames SCAN, Public and VIP) CARS.

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    Search logs events on the Terminal Server and the Local user's PC

    Try disabling the firewall - may have to be reconfigured.

    I suggest that repost you the question in the TechNet Windows Server forum for assistance.

    TechNet

  • Remote Desktop cannot connect to the remote computer to one of the following reasons:

    We are using Windows server 2003 sp2 & windows xp professional sp3. We want to connect to the server using Remote Desktop, but we get the following error:
    --------------------------------------------------------------------------------------------------------------------------------
    Remote Desktop cannot connect to the remote computer to one of the following reasons:
    (1) remote access to the server is not enabled
    (2) the remote computer is disabled
    (3) the remote computer is not available on the network

    Make sure that the remote computer is on and connected to the network, and remote access is enabled.
    --------------------------------------------------------------------------------------------------------------------------------
    We have enabled remote access on the server & the user is member of admin & users group to the remote desktop on the server. The firewall is turned on & exceptions for port 3389 remote desktop.

    Could you please help us on this.

    Hello

    Search logs events on the Terminal Server and the Local user's PC

    What is happening to all users?

    -If you get an error in the TS, then this is a client-side problem.

    -Take TCP Dump using wire shark and see who is the RST sendign package.

    Look for this error message in google that could give you light...!

    Kind regards

    Dhruv

  • The Client computer could not connect to the remote computer

    Hello

    Relating to the name or a customer request. They have a few problems with the remote desktop connection in Windows XP.

    They haveWindows Home Edition and XP Professional on his laptop computer on his desk.

    They say:

    "I took the liberty to install Office remotely on computers, because it was not installed on the desktop.   I was able to connect to my laptop through my desk, but not vica versa. »

    "When I try to connect to my desktop from my laptop, I get an Error Message"the Client computer could not connect to the remote computer... »

    Hello

    You can read the following article and install the patch available to see if contributing to the issue.

    You receive an error message "the client could not establish a connection to the remote computer" when you try to establish a desktop remote connection to a Windows XP-based computer

    I suggest that you post your question in the TechNet forums if you encounter other issues related to the remote desktop connection.

    Windows XP IT Pro Forums.

  • "Error 720: a connection to the remote computer could not be established.

    Earlier, it was working fine. One day it stopped working. I don't write my windows key and the serial number of HP for reasons of confidentiality, but it is authentic.

    I use Windows 7 Home Premium on my laptop HP bought 4 months ago. While trying to connect to internet through my USB data card (I use Auntie Photon +) I get an error message "error 720: a connection to the remote computer could not be established. When I connect the same device to another laptop, it works fine. The USB card company suggests that it is a matter of TCP/IP and I need my OS resintall. I don't have any CD of windows with my HP laptop. I tried to restore my machine, but that did not help. Please help me.

    Hello

    Do the methods and check if this solves the problem.

    Method 1: Try to run the network troubleshooter, check the link for more information on the same.

    Using the troubleshooter from network in Windows 7

    http://Windows.Microsoft.com/en-us/Windows7/using-the-network-troubleshooter-in-Windows-7

    Method2: You can try the steps outlined in the article and check if this gives a probable solution.

    "Internet Explorer cannot display the webpage" error when you view a Web site in Internet Explorer

    http://support.Microsoft.com/kb/956196

    Reset Internet Explorer WARNING:
    Please note that reset the settings of Internet Explorer running resets all of the settings defined by the user, including those established by the installed extensions, toolbars and other add-ons for IE by default. This includes all the security, privacy and settings area. Also this will erase browsing history, delete all temporary Internet, cookies, form data files and especially all the passwords.

    I hope this helps.

  • Error connecting to the remote computer.

    Hello

    I am able to connect to the VIRTUAL LAN, but when connecting to the remote computer using mstsc, I get the error below 'a problem caused blocking the program works correctly. Windows will close the program and notify you if a solution is available. »

    Here are my details of machine:

    Name of the operating system Microsoft Windows 7 Home Basic
    Version 6.1.7601 Service Pack 1 Build 7601
    System model Inspiron N5010
    System Type x 64-based PC

    Antivirus:
    internet security Kaspersky 2012

    Please come back if you need furthur information.

    Could you please getback me ASAP.

    Thank you & best regards

    Anil.

    Hi Anil,

    You try to connect a Windows 7 Home Basic?

    You cannot use Remote Desktop connection to connect to computers that are running Windows 7 Starter Edition, Windows 7 Home Basic or Windows 7 Edition Home Premium.

    See the following Microsoft article.

    Remote Desktop connection: frequently asked questions

    Keep us updated on the status of the issue.

  • How to connect to the remote computer

    Original title: how to goto the program installation and connection to the remote computer.

    Only school in priperly IAM.

    Hello

    Thanks for posting the request in Microsoft Community Forum.

    Please answer the question that helps us provide a better solution.

    What exactly are you trying to do?

    If you try to connect to the remote computer or if you allow someone to connect to your computer, visit the following links and check:

    Connect to another computer using Remote Desktop connection

    http://Windows.Microsoft.com/en-us/Windows7/connect-to-another-computer-using-Remote-Desktop-connection

    Allows a user to connect to your computer using Remote Desktop connection

    http://Windows.Microsoft.com/en-us/Windows7/allow-someone-to-connect-to-your-computer-using-Remote-Desktop-connection

    Hope this information helps. Please feel free to respond if you have any other questions, we would be happy to help.

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