we have a problem when connecting ios device to server Getting black screen and error from iphone Chrome console :Websocket network error The operation couldn't be complated osstatus:-9801.But sometimes same version of ios can connect to server without any problem.
What we did to slove this problem:
1.Changed SSL
2.Run server without any security (without SSL certificate)
3.Changed Websocket Library
4.Tested with other Browsers.
We assumed that was SSL fault because we have blocked access from foreign sites. But when we tested with sslChecker it says we don't had any ssl on server.