Traffic to proxy ip port 443 is sent to 1 link from available 3 links if the same interface is used.
for example
Edge has 3 Links, A B C
All of the links connected to the same interface (GE3)
The proxy traffic is using the same destination ip and port
The proxy traffic is sent by the Link A mainly
the edge is not load balancing the proxy traffic between the links.
SD-WAN edge version less than 5.2.3.0
the defect ID #110283
The Edge software version must be upgraded to 5.2.3.0