TCP?

[Rick Stevens]

Karl Pearson wrote:
> On Thu, October 16, 2008 11:31 am, Rick Stevens wrote:
>> I should have mentioned that you'll need to "service sshd restart" after
>> making the change to sshd_config.  You'll need to restart sendmail as
>> well if you change its config.
>>
>> And if you're asking "why doesn't it fail when I specify 'localhost'?"
>> remember that localhost is in your /etc/hosts file.  When you "ssh
>> localhost" or "telnet localhost 25", the host AND CLIENT IPs are
>> 127.0.0.1 which corresponds to "localhost" in /etc/hosts.
>>
>> I try to give full explanations when I post and I missed it that time.
>> Sorry!
> 
> I had already tried DNS settings. I edited nsswitch.conf and changed it to
> files first, then dns, with this line:
> hosts:      files dns [NOTFOUND=return] files
> 
> and made sure the IPs are in /etc/hosts, which they already were. One email
> went out with alpine from another PC, but nothing more and it took just about
> long enough to time out. Watching it in ps ax showed
> 
> startup with 172.20.20.100
> then
> cmd read: 172.20.20.100
> 
> but all the other ones show the startup line only, then when it times out on
> the client, it changes from the IP to the entry in the hosts file. It's like
> something is preventing things from moving. I'm wondering if I have a bad
> cable or switch.
> 
> I am going to try sshd_config right now and see if that works. Remember, this
> is the box that got duplicate libs which I had to manually delete. There are a
> few duplicates again. It may not be related....
> 
> Okay, changing UseDNS no didn't help at all. Still taking a couple minutes to
> connect via ssh.

Ok, then check your default routes, "netstat -rn" and verify that the
one with "UG" is indeed your default gateway.
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- Rick Stevens, Systems Engineer                      ricks at nerd.com -
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-        Hard work has a future payoff. Laziness pays off now.       -
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