I'm having an issue with iOS 10.0.1 and Safari 10. In iOS 9 and Safari 9, I am able to go a web site on port 4190. As soon as I use an iOS 10 device, I get this error message using Safari 10:
Safari cannot open the page.
The error was: "Not allowed to use restricted network port".
I read online that some ports are blacklisted. Best I could find is a KURL.cpp blockedPortList, but I don't see port 4190 blocked.
I see the error message is in this piece of code:
#define WebKitErrorDescriptionCannotUseRestrictedPort UI_STRING_INTERNAL("Not allowed to use restricted network port", "WebKitErrorCannotUseRestrictedPort description")