Hi, I am facing a disconnection with CAS and DC. I have Thee server new installed server for exchange 2010 with windows server 2008R2 , DC , CAS/HUB, Mailbox servers. Now am facing problem is some times CAS/HUB server to DC will get disconnect for few minutes and will back automatically this time while ping "not reachable " not able to do remote desktop. Same time am able connect CAS/HUB server to Mail box (both ping and Remote)and From Mail Box server to DC (both ping and Remote). What a STRANGE ..???????? HOW CAN I SOLVE THIS ....PLEASE HELP ME...... Thanks UNAISthanks UNAIS

try checking the cable first, if it's not the cable problem try updating the network adapter drivers, if that's not the problen either try with a new network adapter card

Thanks for Replay....... I dont think its network cable issue... because had i said i have three server "DC" ,"MAIL" and "MAILB" ... when disconnection happening its for few minutes, that time i can able to connect to MAIL from out side and from MAIL to MAILB not DC then MAILB to DC happening...so what cd be reason.......? thanks UNAIS

Hi, We'll need to get more info/behavior of the issue especially when the issue is intermittent. You said ping/remote is not working. Are other communication protocols working? are you able to isolate if this is software or hardware issue? As you said in the above post, you suspect its software issue, in that case, do you observe any pattern in event log or is there a pattern in issue producing?Ketan Thakkar | Microsoft Online Community Support

Just update the drivers. If it's an Intel card it has to something with the settings on the card. I remember I had the same problem (no ping, lost of packets, and big delays) on two of my workstations, but never had the time to investigate those settings, so I replace temporarily the network card ( Realtek :-) ) and it works fine.

Thanks for your replay. As i said, This disconnection happening for few minutes. while disconnection happening i can able to connect and ping to other than DC on network from CAS. server and am able to connect and ping to DC from any server than CAS. Communication get stop DC to CAS but same time CAS other server is working and DC to other server is working. Tahnks UNAIsthanks UNAIS

Can you please vefiry the network drivers are updated as someone already suggested? If you issue still persists, I'd suggest take a network trace and reproduce the issue for the traffic and go from there.Ketan Thakkar | Microsoft Online Community Support