Mail Problem. Maybe, it is a DNS Problem!

 
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Operating Systems Linux Red Hat Mail Problem. Maybe, it is a DNS Problem!
# 1  
Old 07-15-2009
Mail Problem. Maybe, it is a DNS Problem!

Hi,

i've a redhat linux 9 upadated by redhat from 7 version to 9 version. A couple of days ago i was a problem with my mail, in other words i'm not able to get any email nor to send any email. I've a proxy configuration and i tried to set iptables in order to verify the port. The 110,255 and 995 ports are opened but the mails on the client stations doesn't work. The mails works only on the server station in eth1 but it doesn't work in eth0. Therefore,i tried to verify name sever and it is incomplete, probably the automatic update raised the problem. Furthermore, i tried to pinging the host name (e.g. pop.gmail.com, domainame, ecc...) but it failed,the same thinks with the telnet command, the message was impossible to connect to the hostname or domainame.

I believe that it could be a band problem because it could not be able to link the IP with the hosts. Someone could ask to me why the http links work, so i believe that the optenet service is able to fix this problem,but only against http links.

Any idea? what do you think?

pintalgi

Last edited by pintalgi; 07-15-2009 at 08:19 AM..
# 2  
Old 07-19-2009
Wow! You are using really old OS Smilie. If it's DNS issue, then there are two thing you will have to look in to:
Code:
/etc/resolv.conf

Make sure that your search domains and name servers are correctly entered.

Next look in to Iptables rules. Check to see if something is being blocked e.g. traffic to DNS server or DNS all together. I'd suggest you to post your rules here.

-Nitin Smilie
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