When dealing with wireless technology, there are a number of circumstances that can block the signal. If the casting button does not appear, your computer does not show up on the list of destinations, or nothing appears on your computer after selecting it from the destination list, then your device is not able to communicate with AirServer for one of a few possible reasons.

• The first thing you should try is powering off and restarting your device(s) and Surface Hub. Make sure your device and Surface Hub are on the same network and are able to communicate with each other.

• Make sure that Bonjour/mDNS and multicast are enabled on your network.

• Try switching off the protocols which you are not using and restart the app. For example: if you are only using AirPlay, switch off Miracast and Google Cast.

• For AirPlay/Google Cast specific discovery issues, try switching off AirPlay/Google Cast, waiting 10 seconds, and switching it back on.

• If that does not solve your issue, run all available updates on your Surface Hub. Your device(s) should also be updated with the latest software updates.

• You may have to adjust your firewall settings to allow AirServer to receive incoming networking traffic (eg. Windows Security on your Surface Hub). Also, ensure the same is done on any firewalls your network may have in use. A full list of required port openings can be found in our knowledge base.

• Another possible cause of your connection issue may be that your connection cannot handle the bandwidth required for streaming or mirroring. You can try connecting your Surface Hub to the network with an ethernet cable to see if the performance is better.

• Are you able to mirror via the AirServer Surface Hub Edition hotspot? If that is the case, the issue might be with your network.

If you are still not able to connect, the issue may be with your network.

• If your network supports interface isolation or Wi-Fi isolation, make sure that these settings are turned off. These settings prevent wireless devices from communicating with each other.

• If you are behind a multi-subnet or Layer 3 network, as is common on larger networks and schools, please ensure that multi-casting is enabled and Bonjour is discoverable across the network. In most cases Bonjour will not be accessible across the network, as it's blocked by default, however, there is a guide you can look over regarding Bonjour across Layer 3 Networks and Multiple Subnets.

• For testing purposes, you could also try to download our AirServer Connect application from either the iOS App Store or Google Play Store. This application is a network helper tool that helps your phone discover AirServer on more complex networks. More instructions on how to use this application can be found in one of our tutorial articles.