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Old 08-30-2004, 10:20 AM   #1
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Registered: Aug 2004
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cannot connect to internet, worked before

RedHat Linux 8.0 setup for a mail server with sendmail. Nothing was modified and all of a sudden I cannot connect to the internet, I believe that is why email cannot be sent/received anymore as well (the BIG problem). HELP PLEASE!!
I can ping the firewall and router, cannot ping anything outside our LAN, outside cannot ping the mailserver by name or IP. I talked to our DNS folks and they say everything checks out on their side.

\etc\hosts is......
# Do not remove the following line, or various
# that require network functionality will fail. localhost mail

\etc\resolv.conf is.......
host = local, bind

nslookup for our domain.......
Address: mail exchanger = 50

nslookup for another domain.....

Non-authoritative answer:
*** Can't find No answer

Trying to send an email out gets the error, "550 5.1.2 <>... Host unknown (Name server: no data known)"

Trying to send an email in from outside gets the error, "Connected to but sender was rejected. Remote host said: 553 5.1.8 <>... Domain of sender address does not exist"
Old 08-30-2004, 10:56 AM   #2
Pete M
Registered: Aug 2003
Location: UK
Distribution: Redhat 9 FC 3 SUSE 9.2 SUSE 9.3 Gentoo 2005.0 Debian Sid
Posts: 657

Rep: Reputation: 32

It would appear from their website here that your ISP has changed their DNS servers

Your /etc/resolv.conf needs to look like this

host = local, bind

Old 08-30-2004, 11:21 AM   #3
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Registered: Aug 2004
Posts: 9

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You're awesome Pete.
Sure enough, Qwest changed the DNS Servers and we never got notification. Worked like a charm once I made the changes.
Thanks a bunch!!!!!!!!!!


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