You will need 17777 and 17778 between your alert central appliance and your orion server.
If we're not using the Orion system, would there be any traffic initiated from external sources? (e.g. if we're using gmail)
No. email is collected by by alert central.
You can try:
• Receiving POP3 Port: 995 (secure port SSL / TLS) | 110 (common port)
• IMAP receiving port: 993 (secure port SSL / TLS) | 143 (common port)
I like the lists that have come up so far, this would be good for the Alert Central Frequently Asked Questions.
From To Ports/Proto For Orion Alert Central Orion Comm Centralizing Orion alerts into Alert Central Email Server Alert Central POP, IMAP, ActiveSync
Centralizing Email alerts into Alert Central
Receiving responses (acknowledgements, notes, etc)
Alert Central Email Server
POP, IMAP, ActiveSync
Fetching email to centralize into Alert Central
Sending email notifications outbound
Alert Central Orion Orion Comm Synchronizing Orion alert status from Alert Central Management IPs Alert Central HTTP/HTTPS Management of Alert Central via console UI Management IPs Alert Central Virtual Server vmWare/Hyper-V client Management of Alert Central appliance via console direct