Can't access aol.com from internal network

coptechs
coptechs used Ask the Experts™
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I have a small LAN with SBS 2011 running DHCP and all of the sudden, none of the computers on the network can access www.aol.com. If I disconnect the router and plug a PC directly into the cable modem I CAN access it so I know it is something internal. The config is such that there is a Linksys/Cisco router NOT running DHCP and then the SBS 2011 has DHCP and DNS.

I've looked at firewalls and tried turning them off to no avail. We've never entered any websites to be blocked in either the router or the SBS 2011.

I'm not really sure where else to look. Any suggestions?
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Commented:
can you ping the address?

Author

Commented:
I was not able to ping the address either. I just re-booted the SBS and I can now access it. Any thoughts on what may have happened?
Commented:
Maybe something with your DNS forwarders on the server. Do your clients point to the SBS server for DNS? Then does your SBS have forwarders setup to point to your ISP's DNS servers?
Managed IT Services, Cyber Security, Backup
Commented:
next time you can't get to aol.com or any site do a nslookup, this will verify it's a DNS issue which I'm 99.99% it is.

If / when the site doesn't resolve during nslookup do ipconfig /flushdns on the server.

Doesn't hurt to do ipconfig /flushdns on the workstation as well.

Test doing another nslookup or by going to the site.

When you restarted the server the above happened, now you can test without restarting if it happens again.

Author

Commented:
Thanks for the input.

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