The original post: /r/mullvadvpn by /u/rmi_ on 2025-05-26 14:11:49.
Hi,
I have a strange problem with Wireguard and Mullvad.
I have serveral clients on my network (Windows, MacOS, iOS, Linux), and most of them work fine without obfuscation enabled. Only my Linux-clients won't send packages unless I enable obfuscation (shadowsocks). They connect fine (the Mullvad-app says they're connected), but they're not sending any packages (no website works and "ping 8.8.8.8" reports 100% package loss). One system even dual-boots to Windows and Linux, and while it works in Windows, it does not work in Linux (one the same machine!).
The reason I want it to work without obfuscation is because I have an UNRAID-Server that does not support the official Mullvad-app and needs to use the normal Wireguard-client, which can't use obfuscation and therefore doesn't work.
I'm on a big ISP and I can't find any reports of VPN-blocking. All clients are directly connected to the ISPs router, nothing special. I tried toying with the MTU (1280), ports, endpoints and IPv4/v6 in the Mullvad-App to no avail. Only enabling obfuscation works.
Any ideas what else I could try? Thanks!