RDP Being blocked

cstallings
cstallings used Ask the Experts™
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We are having a strange issue that we have a subnet of machines that are able to RDP to one of our terminal servers. All of the sudden some machines are no longer able to connect to this terminal  server. We have most that can connect just fine. Then we have some that are no able longer connect. There are all on the same subnet in fact in the same room and building. Any ideas on what could be causing this would be great. Thanks.
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Commented:
I experienced this sort of problem on my network and it turned out to be and issue with the DNS server. The PC's were not being associated properly  and it also caused a problem with their IP's through the DHCP server. You should look at your DNS using one PC to see if you find an issue. Also remove and add it again to the domain to see if that fixes the problem.

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Commented:
Yeah looked at that. We have even tried connecting via IP.
can you ping the TS server?  Have you done an nslookup with name and IP address?
I would try using and port scanner (http://www.angryip.org/w/Download) and make sure that the servers IP address has port 3389 OPEN.  If not, they it is something on your server.  Then from the server I would use the netstat command ex. "netstat -an |find /i "listening"   > c:'openports.txt"  Check to make sure something else isn't trying to use port 3389.

Hope that helps!  Let me know if there is anything else you need help with.

Commented:
Are these 2008 Servers? Also do you have multiple nics? Can you describe your layout a little more in detail, it will help in troubleshooting the steps. Thanks!

Commented:
Are you getting any error msg while connecting..? can you pls check telnetting the port 3389
telnet x.x.x.x 3389

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