If Unity license activation fails with "There was an issue contacting the Unity Servers," it may be due to network blocks like firewalls, antivirus, proxies, or slow internet. Check Unity's status page and disable firewall/VPN temporarily. Add domains such as unity.com, unity3d.com, plasticscm.com, google.com, googleapis.com, microsoft.com, and aka.ms to firewall exceptions. For persistent issues, contact Unity support with log files. Unity Personal requires internet connection with a 30-day offline grace period.
Cause:
If something on your network is blocking the connection to the Unity servers, for example, a slow or intermittent internet connection, antivirus software, a firewall, or a proxy, your license may fail to activate.
The error, 'There was an issue contacting the Unity Servers,' can also show if there is an issue with the Unity Servers. See status.unity.com for more information.
Unity Personal users must ensure they are connected to the internet to use the Editor. There is a 30-day grace period for offline use before you are blocked from working and need to reconnect to the internet.
Resolution:
After confirming a slow internet connection is not the cause of your issue and that the Unity Status page does not list any incidents, try deactivating your firewall and VPN to see if this is the cause of your error.
If you're unable to activate your license after clicking the Try again button, the simplest solution is to add entire domains for the following resources in your exception list before enabling your firewall or proxy again:
- unity.com
- unity3d.com
- plasticscm.com
- google.com
- googleapis.com
- microsoft.com
- aka.ms
If you want to control the subdomains selectively, add items from the table in the proxy exception manual page.
See also: Using Unity through web proxies
If the error continues after following the above troubleshooting guide, contact the Customer Experience team with your log files, which can be found by following our article, 'I have been asked to provide a log file. Where do I find this?'