ID 431744 - [C] Login: Using port 80 or 443 will fail authentication

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Problem summary
Setting the port to the default 80 in the config.yml, then trying to login via the Client fails authenticating.
 
 
Reproduced by support
This bug has been reproduced in: 
6.3.2 - Windows 10
6.3.0 - macOS 10.14

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