iOS 10.0.1 "Not allowed to use restricted network port"

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41 points

iOS 10.0.1 "Not allowed to use restricted network port"

I just upgraded my iPad Mini to iOS 10.0.1. It is now running Safari 10. I tried to visit an internal/private IP on port 4190 using HTTP. I get an error that says:

Safari cannot open the page.

The error was: "Not allowed to use restricted network port".

On iOS 9.3 using Safari 9, the same URL opens fine without this error.

Not sure what has changed from iOS 9.3 to iOS 10.0.1, but I'm unable to visit a web site that I was able to visit previously.

I know WebKit keeps a list of ports that you can not go (e.g. 6666), but 4190 is not a restricted port as far as I know. I'm not sure why I'm getting this error.

iPad mini Wi-Fi, iOS 10

Posted on Sep 20, 2016 11:32 AM

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Answer 1

sunk818 Author

Level 1

41 points

Sep 21, 2016 8:52 AM in response to sunk818

It seems I was looking at the wrong source code.

I finally got a clue where to look after visiting the Safari Technology Preview 13 webpage.

https://trac.webkit.org/browser/releases/Apple/Safari%20Technology%20Preview%201 3/WebCore/platform/URL.cpp

It seems port 4190 got recently added to the list of blockedPortList

2306	2049, // NFS
2307	3659, // apple-sasl / PasswordServer [Apple addition]
2308	4045, // lockd
2309	4190, // ManageSieve [Apple addition]
2310	6000, // X11
2311	6665, // Alternate IRC [Apple addition]
2312	6666, // Alternate IRC [Apple addition]
2313	6667, // Standard IRC [Apple addition]
2314	6668, // Alternate IRC [Apple addition]
2315	6669, // Alternate IRC [Apple addition]
2316	invalidPortNumber, // Used to block all invalid port numbers
2317	};
2318	const unsigned short* const blockedPortListEnd = blockedPortList + ***_ARRAY_LENGTH(blockedPortList);

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