Application and transport layer connection problems

I'm running a redundant configuration: PIX 515E 6.3 (1). I have the following problems to servers on the Internet but only from certain sites.

FTP - finishes negotiating 3 lanes and the 4th package which is used at the login prompt takes about 90 seconds to appear. Once the login prompt appears, FTP is normal speed.

HTTP - this happens on every 1 to 4 hours. SYN and SYN, ACK is going very well. The client who must send the receipt to complete negotiation 3 way sends a RST instead.

SSH - 3 - way handshake is fine, keys exchanged, but the guest of home directory takes 90 to 180 seconds is displayed after a successful login. If the password is incorrect, the session will end in a normal time.

I tested a system in front of the firewall and all scenrios work very well. I also tested the two firewalls, one at a time to exclude a hardware problem on a single PIX.

I've noticed these problems that occur with great frequency, the next day I upgraded to a key 3DES/AES key. Anyone seen this before? Should I possibly ask another key? I've seen these problems to less frequent even before I upgraded the key, so I don't know that that's the problem.

Thank you

RJ

It could be the reverse dns problems - ssh is notorious for taking forever to connect when the ssh server can't do a reverse dns lookup of the host that you connect with.

Basically, if 'nslookup your.client.ip.here' does not return a hostname, it is most likely the problem

Tags: Cisco Security

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