Hello Geeks,
I am facing the strange problem with my mail server....located at client's plant...
It was all working fine ...few days back....as a server crashed ..and I reinstalled everything ...
We have Mailing+Squid Proxy server managed by Webmin...and OS is RedHat 8
When users tries to open a url http://abc.com in the IE...the page gets redireted towards xyz.com
I tried to test it from some other location ...the page gets open very nicely...
But then all the people in the subnet see face the same problem...I checked the access.log of squid...it was showing...

1120566955.468 22 192.168.106.151 TCP_IMS_HIT/304 222 GET http://abc.com/ - NONE/ - text/html
1120567100.296 19 192.168.106.55 TCP_HIT/200 975 GET http://abc.com/ - NONE/- tex t/html
1120567111.349 724 192.168.106.151 TCP_CLIENT_REFRESH_MISS/304 249 GET http://abc.com/ - DIRECT/203.199.80.81 - 1120567121.014 3 192.168.106.55 TCP_IMS_HIT/304 222 GET http://abc.com/ - NONE/- text/html

It dosen't get directed towards a desired page..
So I tried to clear the squid cache ..still the problem persists...
If the user in the subnet bypasses the proxy ...it can open the page very easily..but when connects through proxy ...it dosen't get open...
I checked the squid.conf file...it dosen't have anything to redirect ...in it..
What could be the issue...?

The second problem is related with the same one...
Some times the clients at other locations complain me that they are unable to fetch mail from abc.com (incoming/outgoing server in Outlook)or not able to open the webclient login page..
At the same time I checked it...the page was opening very nicely at my location...
It could be a DNS issue at client's location...but how can ...all of a sudden the problem related with abc.com..arising...?
Is there any problem with squid....?

Thanks in advance...

what youre describing sounds like an issue with the squid cache. how did you go about clearing the squid cache? I would try clearing it out again then restart the service.

as for the email issue, i doubt its a dns problems since dns has nothing to do with mail servers. mx records are what point mail server names to ips. and unless your isp or other mx host has been updating their system, theres a slim chance thats whats causing your mail server issues. I also doubt that squid is causing the problem with your email client connections.

its really hard to troubleshoot an issue like "every once in a while a client cant connect". you really need to pay attention to the server logs at the very instant the client calls to complain.