what requires ssdp
SSDP/UPnP Dependency. Components may utilize SSDP or UPnP/SSDP in combination. The following are the rules required for SSDP: dir=in protocol=17 lport=1900 binary=%systemroot%\system32\svchost.exe svc=ssdpsrv. dir=out protocol=17 rport=1900 binary=%systemroot%\system32\svchost.exe svc=ssdpsrv.