NSAppTransportSecurity not working in URL with port number

Question

I have a problem here. I have to call two URLS:

https://www.example.com/

https://www.example.com:83/

In the first URL (without the port number), I have no problems because the SSL certificate is valid. But in the second URL (with the port number) the SSL certificate is invalid, so I'm going throw kCFNetworkCFStreamSSLErrorOriginalValue.

I add NSAppTransportSecurity key in my Info.plist:

<key>NSExceptionDomains</key>
<dict>
    <key>example.com</key>
        <dict>
            <key>NSExceptionAllowsInsecureHTTPLoads</key>
            <true/>
            <key>NSExceptionRequiresForwardSecrecy</key>
            <false/>
            <key>NSIncludesSubdomains</key>
            <true/>
        </dict>
    <key>example.com:83</key>
        <dict>
            <key>NSExceptionAllowsInsecureHTTPLoads</key>
            <true/>
            <key>NSExceptionRequiresForwardSecrecy</key>
            <false/>
            <key>NSIncludesSubdomains</key>
            <true/>
        </dict>
</dict>

Unfortunatelly, this is not working. I'm thinking that maybe the error is related to the fact that I'm using a port number in the URL.

Any help?

Thank you!