I have a Windows 2000 server from where I cannot telnet to port 25 or 110 (Exchange server or SMTP lets say server1) after some days. At the same time, I can telnet server1 (on port 110 / 25) from other machines. This is a database machine and runs SQL Server 2000. Other than that there are no other s/w running.
I can reboot the machine to resolve the issue. I have done the following checks:
1. Proc & Mem usage are acceptable.
2. No errors or warnings logged in Event Viewer.
3. Ran a NAV scan as well as online scan from Trend Micro and nothing was detected.
After a reboot it works fine for some days and again the issue surfaces. I tried to find any patterns and there are none.