[K12OSN] slow SSH login problem
John Lucas
mrjohnlucas at gmail.com
Thu Feb 8 11:05:08 UTC 2007
On Wednesday 07 February 2007 23:50, David Whitmer wrote:
> Thanks everyone for your advice.
>
> When I checked the server, SSH logins is working fine now. I had done
> a yum update last weekend... perhaps that corrected something.
>
> I did check sshd_config. The "UseDNS" line was already commented out.
> Would it default to "no" in that case, or "yes". SSH login is
> working now, so many it doesn't matter too much right now.
>
The default values are commented out for documentation. The default value is
"UseDNS yes". It *is* turned on.
> To answer another response, this particular server only uses local
> authentication... no LDAP or NIS. Ping responses were okay, too.
>
Yes, and you currently are not experiencing the problem either. Take some
baseline ping mesurements now while it is working correctly; if the problem
crops up again, you will have something to compare to. If the problem
returns, test DNS directly by using "dig" with each of your nameservers too.
I don't think your updates had anything to do with creating or fixing the
problem; it may have been a transient problem on your ISP's network and may
never show up again or something no one has mentioned yet, but it is a good
idea to develop some systematic diagnostics and taking baseline data is a
good place to start. If you can use "traceroute" (many firewalls prevent it's
use) it would be a good idea to record the route to several well known
locations (like www.google.com for instance); then if a problem crops up you
can see if your routing has changed or where it stops.
--
"History doesn't repeat itself; at best it rhymes."
- Mark Twain
| John Lucas MrJohnLucas at gmail.com |
| St. Thomas, VI 00802 http://mrjohnlucas.googlepages.com/ |
| 18.3°N, 65°W AST (UTC-4) |
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