"traceroute -I domain.com" as root might help track down the problem.


On Thu, 25 Apr 2013 21:03:41 -0500
Nathan Moore <[log in to unmask]> wrote:

> Context: small academic cluster of SL5.8 machines, x86_64.
> 
> Recently, some of the machines on the cluster stopped being able to
> access the outside internet.  Machines can still update via ftp, yum,
> nslookup, and ping, but http requests beyond the local cluster seem
> to be universally denied.  I've never encountered a problem like this
> before (and it is probably my own fault, as I am a self-taught
> sys-admin), but I'm wondering if anyone else has seen a similar
> problem.
> 
> Bonus points if you can tell me where in /etc  or /var I should look
> to find the offending config file.
> 
> regards,
> 
> NTM