Issue with webmail server

[robinh007]

Hi,

My Webmail server is hosted remotely and is NATed through a public IP. While the login page is accessible, I am unable to log in. The network is configured with a dual-WAN setup using SD-WAN interfaces. I have observed that when one of the ISPs is disabled, I can successfully access the mail account. An SD-WAN rule has been created, but webmail access is only possible when a specific ISP is used or the other is disabled. Could you suggest a resolution that allows webmail access without relying on an SD-WAN rule or policy route?

#Fortigate

[AEK]

Hi Robin

Probably your traffic is load-balanced across WAN links.

As a test, try with a SD-WAN rule to force your traffic (your client IP as source) to be forwarded through one specific WAN link.

[dingjerry_FTNT]

Did you use a VIP for your webmail server access?  If yes, did you configure the VIP with one ISP link only?