openMSX's built-in socket communication doesn't play nice with most routers' NAT. Instead of messing with UPnP:
Outdated or corrupted app data can prevent the link from opening. : Open the Microsoft Store and check for updates to the Xbox Game Bar Gaming Services Repair/Reset Windows Settings > Apps > Installed Apps Search for "Xbox". Click the three dots and select Advanced options Scroll down and click . If the issue persists, try Repeat these steps for the Xbox Game Bar 3. Adjust Online Safety Settings msxblmultiplayer link fix updated