SSH and changing DNS servers

[gboyce at badbelly.com]

Hugh,

What do you mean by "restarted our remote server"?  Do you mean reboot, or 
restarted some of the software?

If you mean a reboot, I would guess either sshd isn't set to start 
automatically on boot, or you may have some firewalling setup that is 
blocking port 22.  The reboot might have reset the firewall rules or 
enabled it when it was disabled before.

If you can get into the remote server, check if sshd is running.  If it is 
not running, attempt to start it (usually either /etc/rc.d/init.d/sshd 
start and /etc/init.d/sshd start).  

Setting it to start automatically on boot depends on what linux distro you 
use.  Redhat can do it by running "chkconfig sshd on".

On Thu, 4 Sep 2003, Hugh Rutledge wrote:

> Our ISP required us to change DNS server addresses
> this month.  (Not by telling us,  but by stopping
> service on the old addresses.)  When we did this and
> restarted our remote server,  it no longer accepts any
> ssh access to its ssh ports-- but is processing html
> and mail requests fine.  
> 
> Any insights on why this problem arises and how to
> repair it?  Reinstallation of SSH appears to be the
> brute force way to resolve it.
> 
> Thanks
> Hugh Rutledge
>