Created enhancement request FB21841433

For now, yes. We are also reaching out to other customers to test it on iOS 26.

This is a customer setup, and we are unable to reproduce the issue locally in our lab. The customer is experiencing unusual behavior they report that VPN performance is fine when connecting to a nearby VPN server, but it slows down when connecting to a server in a distant location. We have asked them to check their network and infrastructure on their end, as we believe this may not be a VPN issue, they are looking into it. For the first issue where the VPN fails, our investigation suggests that the socket enters a bad state once the device is locked and extension goes to sleep. It is neither timing out nor sending data, which indicates the socket enters a bad state and the resource is not accessible. Note: Both issues are not reproducible on iOS 18.

Update: We are observing strange behavior with iOS 26, where there is noticeable slowness when connecting to a VPN server in a distant location. For example, connecting from India to a US VPN server is very slow, while connections to an India-based server work fine and vice-versa. We tested the same use case on iOS 18 and found that both servers work without any issues.

We are the VPN developer, and this issue has been reported by one of our customers using our VPN product. It is reproducible only on iOS 26.

hi @kbrock, Did you find the solution or any workaround? I do see the problem still.

I believe issue is not with iOS, it is with Big Sur. Need to check whether the same is coming in latest Mac versions.

It doesn't work with Xcode 13.1. I use BigSur 11.6.1 and iOS 15.1. Actually it works intermittently when we restart phone or System, Not sure what fixes the problem and it comes back if we disconnect the phone. No clear work around yet.