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Unable to access web or email, but connected to Internet

Posted on 2007-11-15
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Last Modified: 2009-07-29
After an automtica re-start last night (Windows updates I think), this customer's SBS 2003 server is connected to the nNternet (broadband) and I can access it fine remotely via PCAnywhere.

However it will not access the web and no emails coming through in or out.

I've checked with the ISP, no problems there. I can ping the ISP's DNS.  We're restarted the server and disconnected and re-connected the router.

Someting may have happend on the sever?  

Any ideas. Pretty urgent, please?
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Question by:gerlis
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by:KCTS
ID: 20288062
Check that forwarders are enabled in the DNS console and that entries exist for your ISPs DNS Servers - see http://www.petri.co.il/configure_dns_forwarding.htm

If using DHCP check that the Option 006 points to your SBS server

For staatic IP addresses check that the preferred DNS server is your SBS server
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by:ormerodrutter
ID: 20288063
Have you rerun the CEIEW?
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by:Dozer42
ID: 20288072
Start with the basics. Remote into the machine. Check all the log files for failed services at startup. Telnet to all the relevant email ports:

Telnet (mailservername) 25
Telnet (mailservername) 110
Telnet (mailservername) 80

Port 25 is standard smtp, 110 is POP3, 80 is http (and it usually open for webmail connections at least until they're passed over to https).

Find out what updates were installed and if they would affect mail.

Try sending mail locally, from an account on that machine to an account on that machine.

Check any errors or bounces.

Shut down antivirus/firewalling for a couple seconds to check and see if that might be interfering. \

Even though you checked it, check the primary and secondary MX record with the ISP. Check the domain name to make sure it's not expired.

Start with the basics and work your way up, you'll find it.
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by:gerlis
ID: 20288121
Thanks for this. I'll check these out.

But, is anyone aware of any known problems wth the latest Windows  updates, this machine re-started last night after a Windows update

 Also my colleague has had problem with his Vista this morning after a Windows update

I've found:

http://www.crn.com/software/202805887

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by:Dozer42
ID: 20288129
I haven't run into any problems with my clients running Exchange server. They got the updates and everything went smoothly, which isn't always the case.
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by:gerlis
ID: 20288157
Hmmm, though in this case they cannot access the web either
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by:gerlis
ID: 20289585
OK, I went through most of these, but nothing obvious showed up.

I contacted a colleague and after some tweekaing managed to have it working again. He is not entirely sure as to the cause oir even what bit exaclty cured it, but almost certainly it was a problem with the DNS on the server and has reset it.

We reckon the Windows update last night and auto-reboot may have been the real culprit. He's going to let me know what things he did in a bit more detail, so there is still a chance that one of yo were near to the answer and will win the points!
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gerlis earned 0 total points
ID: 20595343
It was apparently a DNS problem, he put in a DNS he knows worked which seems to force to to recognise the proper original DNS again.  The Windows update may have been a red-herting, but nonethless the server re-start may have upset the DNS.

The problem has not recurred since. So remains a bit of a mystery for now.

Thanks all, but no points this time.
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by:Vee_Mod
ID: 20630951
Closed, 500 points refunded.
Vee_Mod
Community Support Moderator
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