Re: [exim] smtp timeouts / what to look for

Zbigniew Szalbot wrote:

>
> I do seem to be having some basic problem with (tcp)traceroute:
>
> tcptraceroute 209.191.118.103 25
> Selected device fxp0, address 192.168.16.4, port 56180 for outgoing packets
> Tracing the path to 209.191.118.103 on TCP port 25, 30 hops max
SNIP
>
> tcptraceroute tahini.csx.cam.ac.uk 25
> Selected device fxp0, address 192.168.16.4, port 49894 for outgoing packets
> Tracing the path to tahini.csx.cam.ac.uk (131.111.8.192) on TCP port
> 25, 30 hops max
> 1 * * *
> 2 * * *
> 3 * * *
> 4 * * *
>
> Although
> telnet tahini.csx.cam.ac.uk 25
> Trying 2001:630:200:8080:204:23ff:fed6:b664...
> telnet: connect to address 2001:630:200:8080:204:23ff:fed6:b664: No
> route to host
> Trying 131.111.8.192...
> Connected to tahini.csx.cam.ac.uk.
> Escape character is '^]'.
> 220 tahini.csx.cam.ac.uk ESMTP Exim 4.69 Thu, 13 Mar 2008 09:06:19 +0000
>

This more than probably means that your firewall is blocking the trick
used by the traceroute utility, maybe by imposing a fixed ttl or using
some protocol inspection. I'd suggest you see with the person in charge
of the firewall to at least temporarily permit tcptraceroute on port 25.