iOS 15 Safari Set NSUrlSession Websocket ON

Question

iOS 15 Safari Set NSUrlSession Websocket ON

James Marx 1

I'm trying to send WebSocket package on a https website to a C# WebSocket Server, When Safari Experimental Features → NSUrlSession WebSocket is On.
My WebSocket server, can't receive the whole package, does any one facing this problem too, and get resolve?

Limitless Technology 37,766 Reputation points

2021-09-24T12:06:35.717+00:00

Hello @James Marx

I would recommend to check TLS settings, in my case I needed to enable TLS 1.2, as TLS 1.3 seemed problematic in this sense.

Otherwise, could you share if you can find any specific WebSocket error when inspecting from Safari? Something in the line of: [Error] WebSocket network error:

Hope this helps narrowing it down,
James Marx 1 Reputation point

2021-09-27T02:56:16.953+00:00

Our IT, is help me setting TLS 1.0 to 1.2, but the problem didn't solve.

Btw, about specific WebSocket error, I'll need to find other method to log it out.

thanks for the response. :)

Limitless Technology 37,766 Reputation points

2021-09-24T12:06:35.717+00:00

Hello @James Marx

I would recommend to check TLS settings, in my case I needed to enable TLS 1.2, as TLS 1.3 seemed problematic in this sense.

Otherwise, could you share if you can find any specific WebSocket error when inspecting from Safari? Something in the line of: [Error] WebSocket network error:

Hope this helps narrowing it down,
James Marx 1 Reputation point

2021-09-27T02:56:16.953+00:00

Our IT, is help me setting TLS 1.0 to 1.2, but the problem didn't solve.

Btw, about specific WebSocket error, I'll need to find other method to log it out.

thanks for the response. :)

Answer 1

Yes, this is an issue that is occurring in Safari 15 (on any platform: iOS, iPadOS, macOS) due to that "Experimental Feature" being enabled.

With the release of iOS 15.2 Beta 4 now out, it appears that it will not be resolved soon (i.e., NSUrlSession disabled by default.)

There are anecdotal reports of other potential solutions but the only consistent one appears to be turning off the NSUrlSession WebSocket option.

Edit 1: The messages that we are sending (and are failing in Safari 15) are less than 25 bytes.

Answer 2

To turn off NSURLSession, I found these instructions [https://cockpit-project.org/running/safari] useful, but disable “NSURLSession WebSocket” instead of enable. Maybe this will help others who have problems with websockets on iOS 15.

Short summary:

Open the Settings app
Scroll down and tap on “Safari”
Scroll down to the bottom and tap on “Advanced”
Tap on “Experimental Features” at the bottom
Scroll down until you see “NSURLSession WebSocket”
Disable “NSURLSession WebSocket”

iOS 15 Safari Set NSUrlSession Websocket ON

2 answers

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