Yesterday one of our older laptops hit an error during the startup of WireGuard for Windows 0.4.2 that I haven't seen before. It looks like it failed to set the name of the WinTun adapter because there were "no more endpoints available from the endpoint mapper". It left the tunnel in an inactive state, but it started up just fine when I told it to activate today. I've attached the log in case it's of interest. Here's the snippet where the failed startup took place: 2021-08-06 19:46:15.039160: [MGR] Starting WireGuard/0.4.2 (Windows 10.0.19043; amd64) 2021-08-06 19:46:18.899902: [TUN] [SCJ] Starting WireGuard/0.4.2 (Windows 10.0.19043; amd64) 2021-08-06 19:46:19.249315: [TUN] [SCJ] Watching network interfaces 2021-08-06 19:46:22.608757: [TUN] [SCJ] Resolving DNS names 2021-08-06 19:46:22.608757: [TUN] [SCJ] Creating network adapter 2021-08-06 19:46:32.157022: [TUN] [SCJ] [Wintun] WintunCreateAdapter: Creating adapter 2021-08-06 19:46:41.129852: [TUN] [SCJ] [Wintun] SelectDriver: Using existing driver 0.13 2021-08-06 19:46:41.237299: [TUN] [SCJ] [Wintun] WintunCreateAdapter: Failed to register adapter 17 device: The device instance does not exist in the hardware tree. (Code 0xE000020B) 2021-08-06 19:46:42.457251: [TUN] [SCJ] Retrying adapter creation after failure because system just booted (T+1m39.109s): Error creating interface: winapi error #3758096907 2021-08-06 19:46:42.457251: [TUN] [SCJ] [Wintun] WintunCreateAdapter: Creating adapter 2021-08-06 19:46:44.047474: [TUN] [SCJ] [Wintun] SelectDriver: Using existing driver 0.13 2021-08-06 19:51:51.408322: [TUN] [SCJ] [Wintun] WintunSetAdapterName: Failed to set adapter name: There are no more endpoints available from the endpoint mapper. (Code 0x000006D9) 2021-08-06 19:51:51.408322: [TUN] [SCJ] [Wintun] WintunCreateAdapter: Failed to set adapter name SCJ 2021-08-06 19:51:52.392522: [TUN] [SCJ] Unable to create network adapter: Error creating interface: There are no more endpoints available from the endpoint mapper. 2021-08-06 19:51:52.442380: [TUN] [SCJ] Shutting down 2021-08-06 19:51:52.540997: [MGR] [SCJ] Tunnel service tracker finished The Laptop is an old Lenovo E555 with an AMD A6-7000 in it. It's not fast. This could be some sort of race condition with slow-to-start Windows services. The log indicates that it was updated from WireGuard 0.3.11 to 0.4.2 earlier that day. That might be a coincidence, but it might not be. Joshua Sjoding SCJ Alliance IT Specialist www.scjalliance.com