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Invalid credentials when attempting to use IMAP SSL with Exchange 2003

Last Modified: 2012-05-11

I'm in the process of enabling IMAP SSL for an external user. I've looked over the documentation and am pretty sure I've followed the correct procedures. This is for a Exchange 2003 SP2 on SBS 2003. In a nutshell, I have done the following:

- Enabled the IMAP service for auto start.
- Tested IMAP (143) successfully from outside.
- Forwarded Port 993 to the server from the firewall.
- Ticked the box in the default virtual IMAP  server to require SSL.
- Applied a self-signed certificate.
- Verified the port numbers for unencrypted and encrypted IMAP traffic under advanced.
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: DOMAIN(testacct)
   Server: mail.domain.com
   User name: testacct
   Protocol: IMAP
   Port: 993
   Secure(SSL): 1
   Code: 800ccc0f

I've tried establishing a Telnet connection to port 993 but the connection times out. This is both externally and from the localhost. I do have Routing and Remote Access enabled for VPN connectivity and wonder if this might ahve something to do with it. Though I checked for NAT/Basic Firewall under the RaRA settings and it is not an option the is present.
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