I have had this warning from windows defender, it will not let me block it giving error message 80501001. It mentions 1263 UDP. enabled windows media format SDK (iexplore.exe) I was online at the time. The error message in the event viewer states this path firewallport:HKLM\System\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\GloballyOpenPorts\List\\1263:UDP Is this safe to allow? I have scanned with defender and ewido, all clear.