socketserver.ThreadingTCPServer.allow_reuse_address must be False on Windows systems, else several servers might be started on the same port, and unspecified behaviour will happen Fixes: #4695 Change-Id: Ic9f193e23854f9cd3413ab6e664ca8029a7c9c76 Reviewed-on: https://forge.frm2.tum.de/review/c/secop/frappy/+/30523 Tested-by: Jenkins Automated Tests <pedersen+jenkins@frm2.tum.de> Reviewed-by: Georg Brandl <g.brandl@fz-juelich.de> Reviewed-by: Markus Zolliker <markus.zolliker@psi.ch>