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Max Melcher

1 minute read

When accessing Central Administration with Google Chrome you will get the following:

"This webpage is unavailable"

with the description:

Error 312 (net::ERR_UNSAFE_PORT): Unknown error.

In order to fix that edit the Properties of the Chrome link and append the following to the “target” value:


where 42 is the port for your Central Administration. You can add more ports if you want, in total it should like this:

C:\Users\mmelcher\AppData\Local\Google\Chrome\Application\chrome.exe --explicitly-allowed-ports=42,84,87


Still dont like it - ports are not unsafe by default - but at least there is an option to allow it. Dont you think?



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