One of the most common causes that will trigger this error is a glitched network adapter. In this case, resetting the network adapter should allow you to fix the issue. On the other hand, if the issue is caused by an unopened port, you should be able to fix the problem by enabling UPnP on your router settings or by forwarding the port used by Overwatch manually.
Resetting the Network Adapter
If you’re encountering the issue on a PC, it’s possible that you’re dealing with a network inconsistency facilitated by your network adapter. If this scenario is applicable, you should be able to fix the problem and play your game normally by resetting your network adapter to the default configuration – this procedure is commonly referred to as a ‘winsock reset or ‘coms reinstall‘. Follow the instructions below to fix an inconsistent network adapter on any recent Windows version: In case the same BC-124 error is still occurring, move down to the next potential fix below.
Enabling UPnP
In case you already reset your network adapter to no avail or this method above was not applicable to your current scenario, your next troubleshooting attempt would be to ensure that your router is capable of handling the ports used by Overwatch. Nowadays, the vast majority of end-user routers handle this through a feature called UPnP (Universal Plug and Play). So if this scenario is applicable, you should be able to fix the BC-124 error by enabling UPnP. This potential fix is confirmed to work for users encountering this issue on Xbox One, Ps4, and PC. Note: Keep in mind that the steps of enabling UPnP will be different depending on the router that you’re using. However, the steps below should be a close fit for the most part, Here’s what you need to do to enable UPNP: In case you’re still encountering the same BC-124 error.
Forwarding the ports used by Overwatch
In case UPnP is not available no with your router, it’s very likely that you’re facing the BC-124 error because your networking device is unable to allow incoming network requests. If this scenario is applicable, you should be able to fix the issue by forwarding the ports used by Overwatch manually from your router settings. To do this, follow the instructions below to forward the ports used by Overwatch: Note: Keep in mind that the steps will be a little different depending on your router manufacturer.
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