Users may find that when they have enabled the Anonymous Proxy Guard, Outlook 365, Google Apps, and other similar services. They will either not properly connect to their services, or they will routinely lose connection. This may cause numerous functions of these services to become unusable.
The Anonymous Proxy Guard is designed to watch for HTTP/TCP traffic over non-standard ports, and block that traffic. When this occurs to legitimate traffic, one must create a rule to send that traffic to the Web Filter. Please see the document at the following link to learn how to send this traffic to the Web Filter.
These are the following ports you should create Application Signatures for, to send said traffic to the Web Filter.
Mail Routing Port: 25
Outlook Web App: 10106
SMTP Relay Port: 587
IMAP Port: 143
IMAP Port: 993
POP 3 Port: 995
Lync Application sharing and file x-fer Ports: 50040:50059
SMTP Incoming Server Port: 995
SMTP Outgoing Server Port for TLS/STARTTLS: 587
SMTP Outgoing Server Port for SSL: 465
IMAP Incoming Server Port: 993
Please note that if you have already added an initial Application Signature to the Traffic Flow Rule Set to open a port for Outlook 365 or another application, you should NOT add a second Signature for the same port used by a different application. The original Signature will work properly for both applications.