Forwarding Virtual Servers, SNAT Pools, and Port Collisions

Based on my understanding of the TCP Close Timeout this should force any connections to wait 16 seconds before attempting to reuse a given four-tuple after the connection is successfully closed

i do not think snat port is reserved until close timeout passes.

TIME_WAIT and “port reuse”

anyway, can you try to change tm.portfind.linear and tm.portfind.random db variables to see if they help?

 tmsh modify sys db tm.portfind.linear value 0 
 tmsh modify sys db tm.portfind.random value 32