I have a problem to get emails Gmail and other external emails with IMAP (port 993) and smtp (port 465).
We are using Windows live and Outlook email clients. The network configuration is:
Clients behind ISA 2006 server, connected by Cisco switch 3560. The Isa server has to IPs internal and external connected to ADSL modem (Cisco Router 2901). Network map is attcahed
When I try to connect directly to the modem the email works perfectly, I can receive and send. But when connect to the Internet through ISA I get the error:
Your IMAP command could not be sent to the server, due to non-network errors. This could, for example, indicate a lack of memory on your system.
Account: Gmail (xxxxxxx)
User name: firstname.lastname@example.org
Actually the emails are OK before changes to the network and installing the new switch Cisco 3560 and Government router.
From where should I start to identify the problem? Is it form ISA server or Cisco switch that close the ports 993 and 465???