Long connection pauses?

[Bruce Dawson]

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Ben Scott wrote:

|On 1/8/06, Brian Chabot <brian at datasquire.net> wrote:
|
|>I have a relatively new machine that pauses for 20-120 seconds between
|>SYN/ACK and issuing the banner on all TCP connections.

Typically, this is indicative of DNS resolution problems. Check your
/etc/resolv.conf.

|>
|>  Kevin's right in that you need to provide more information.
|>
|>  Since TCP itself never issues a banner, you're clearly talking about
|>some higher-level protocol(s) layered on top of TCP.  What are they?
|>
|>  Is the machine running a firewall?  What happens if you shut it off?
|> (You'll want to make sure the box is well secured before you do
|>that.)
|>
|>  Are you traversing a firewall, NAT boundary, load balancer, or some
|>other "smart" device on your way to testing the connection?  What
|>happens if you start the connection beyond said device?
|>
|>  Try shutting down all but a few services.  For example, stop
|>everything but syslog, network, and sshd, and then see if you can
|>connect to sshd.
|>
|>The machine is running Mandriva 2006, but so are three other machines on
|>the network and none of them have this problem.  All the xinetd settings
|>are identical, as are resolv.conf
|
|
|  The difference must be somewhere else, then.  :)
|
|  Unless by "identical" you really mean "mostly the same", which often
|later becomes "mostly the same except for the one critical thing I
|overlooked".  :)


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