I am having an issue with a few of our MS 2008 R2 servers. We have an Exchange 2010 environment with 2 CASHT and 2 DB server at our prduction site and 1 of each at our DR site. Our production is set up with Virtual CAS Array IP address of .40 and that is ditributed to the CAS servers via NLB. For some reason, from some servers I am not able to telnet into the CAS Array IP but I am able to telnet into the individual servers. If i am able to telnet into the individual servers, I dont understand why I would not be able to into the CAS IP address.
Hopefully someone has experienced this issue as I am having trouble finding anything specific to my issue.
Posts: 25
Joined: 30.Nov.2011
From: INDIA
Status: offline
To which port are you telnetting ..i.e is it port 80,135 etc.
Also while you configured Windows NLB you have to specify port rules so that its accessible from outside to the clients. You have specify port rules for the default ports such as 80,135, 443 .Check this if it is configured. Create a port rule for the TCP ports 1024-65535.
I am trying to telnet on port 25 to the ip of the cas array locally. It works from some machines, but it does not work on a few. I think the ones it is not working on are all server 2008. And all of the machines i have tested from are on the same subnet as the exchange servers so i find it weird that some would work and some it wouldnt. I am thinking it may be a server 2008 issue.
also, the default port rule to allow everything is still intact. I am going to leave that for now until i figure out this issue, and then change to allow on the specified ports.
I don't think CAS arrays handle SMTP traffic. CAS arrays are only for client connections (MAPI, EAS, OA, etc). I am not 100% sure but that was my understanding.
May be the case but i am able to telnet to port 25 on 99% of the machines in our environment. When relaying, the traffic is on port 25, and i should be able to connect to the cas array IP, which then forwards the traffic to one of the 2 servers. The problem is not just that i cant telnet, i cant relay unless i point directly to the one fo the 2 cas servers and that is not the case with the other servers
Just Windows 2008 Standard R2 Application servers that need to send email notifications. I have only seen it on 3 servers, they are all 2008.We have pretty much identical machines for a recent software deployment that consists of 3 servers, one of the 3 cant telnet to port 25 by the cas array name, it is very random.
One more thing that may make more sense that i just found. The CASHT roles are virtual machines and any server(not just 2008) that is assigned to the same host at the CASHT, can not relay off of the NLB VIP, but it can off of the individual IP addresses of the CASHT servers. As soon as i move it to another host, it works fine.
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