Petals server Network ports remain open after python process shutdown

After shutting down a petals server in suggested fashion (ctl-c style interrupt) the port used for the server remains open when the port is properly forwarded to the public internet. Failed requests to these open ports also occur a few min. after shutdown, causing noticeable slowdown for other non petals uses of the router until the open ports are closed.

Using Ubuntu Server 23.04, 32gigs of ram, merlin-wrt software on asus RT AX86U router connected via 2.5 ethernet to 2 gig fiber. Petals installed without use of docker.