I have an issue with Exchange 2003 SP2 where POP3 is not working. Essentially users cannot connect to it - when telnetting to it on port 110 the banner is not displayed but it does connect - it looks like it is waiting for a response from the client; however as soon as I start to type anything the server breaks the connection. When telnetting from Linux it breaks the connection straight away.
Nothing is on the logs - apart from the service being successfully restarted which does not fix the problem. I tried changing around all the POP3 settings, still not luck.
I have ruled out network issues - issue occurs when telnetting to 127.0.0.1 as well.
Please let me know if you require further information. Does anyone have any info on what this could be?