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How to reproduce:
1. Launch Unity Hub
2. Observe the result
Actual result: Unity Hub does not open and a critical error pop up appears
Expected result: Unity Hub opens
Reproducible with: 3.18.0
Reproduced on: Windows 10 (by the users), Windows 11 (by the users), macOS (25.3.0) arm64 (by the users), macOS (25.4.0) arm64 (by the users)
Not reproduced on: No other environments tested.
Error in the logs causing this issue:
{"level":"error","time":"2026-05-24T16:47:11.286Z","pid":20788,"moduleName":"App","msg":"Failed to start Unity Hub, reason Error: listen EADDRINUSE: address already in use \\\\.\\pipe\\Unity-hubIPCService\n at Server.setupListenHandle [as _listen2] (node:net:1926:21)\n at listenInCluster (node:net:2005:12)\n at Server.listen (node:net:2127:5)\n at file:///C:/Users/vera1234/Unity%20Hub/resources/app.asar/build/main/unityIPCNameFormatter-C-GhMNqh.js:358:16\n at new Promise (<anonymous>)\n at IPCServer.start (file:///C:/Users/vera1234/Unity%20Hub/resources/app.asar/build/main/unityIPCNameFormatter-C-GhMNqh.js:350:10)\n at UnityIPCServer.startIPCServer (file:///C:/Users/vera1234/Unity%20Hub/resources/app.asar/build/main/UnityIPCServer-Dyw10vbn.js:56:21)\n at HubIPCService.start (file:///C:/Users/vera1234/Unity%20Hub/resources/app.asar/build/main/EditorCommunicationService-DXUJOtbd.js:90:24)\n at EditorCommunicationService.startIPCService (file:///C:/Users/vera1234/Unity%20Hub/resources/app.asar/build/main/EditorCommunicationService-DXUJOtbd.js:347:27)\n at file:///C:/Users/vera1234/Unity%20Hub/resources/app.asar/build/main/app-BHPhhbiz.js:79775:60 {\n code: 'EADDRINUSE',\n errno: -4091,\n syscall: 'listen',\n address: '\\\\\\\\.\\\\pipe\\\\Unity-hubIPCService',\n port: -1\n}"}
Potential workarounds:
For Windows: Open Task Manager, locate any hidden/background Unity Hub.exe processes, and force close ("End Task") all of them. Then relaunch.
For macOS: Open the Terminal and delete the stale file manually by running:rm /tmp/Unity-hubIPCService.sock _(Alternatively, simply restarting the machine will also clear the /tmp folder and fix it)._
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