We have a service that relays voicemail to email for several domains. After working fine for years, suddenly it stops working about every 6 hours (about every 10 hours during off hours). Rebooting resolves the problem for another 6 hours. The Event Logs don’t seem to provide any guidance. It seems like TCP quits working until the reboot. I’m not sure how to troubleshoot. I can telnet locally or remotely to port 25, until after about 6 hours I cannot. Everything else seems fine, but no TCP port 25 activity. When I do netstat find /i and it is working, it shows LISTENING, ESTABLISHED and a process number. Then that process shows Edgetransport.exe the process number, then 0 and 180,468 K. When it has failed, netstat find /I returns a blank line.
Any suggestions on resolving or troubleshooting I would appreciate.
It is Exchange Server 2010 on Windows 2008 R2 and has worked for several years.
It passes external tests for Open Relay. (Not an Open Relay)
Thank you
JC