Re: Timeouts 






Hi Mark, I phoned our ISP they lowered the MTU on our modem now
everything is working fine.

Thanks for your reply.

Regards
Mario

Mark Martinec wrote:

Mario,

  

We do have a cisco router/modem but ESMTP/SMTP inspection is not being done.
The ISP guy told me to relay through their smtp server but our issue is not
sending the mail its receiving the mail for example, I tried to mail myself
from my gmail account but i receive a delivery failure message.
    


  

Feb 26 13:16:25 toeksie postfix/smtpd[8286]: timeout after DATA from
nf-out-0910.google.com[64.233.182.189]
    


Does your firewall (or some other box on the route) by any chance
block ICMP type 3 packets? It shouldn't, otherwise path MTU discovery
does not work (type 3 code 4) and a TCP session can hang until it
times out.

  Mark

  



