Hi Kevin,
If you are using a proxy server, please configure the proxy server IP address and port number in the PB.ini file (by default, the INI file is located in C:\Users\<username>\appdata\local\appeon\powerbuilder 19.0\ in Windows 7 or later). Copy the following section to the INI file and set the appropriate value for the proxy server:
[SourceControlProxy]
Url=192.0.0.88
Port=80
Username=
Password=
Timeout=10
BTW, I also suggest that you try if you can connect successfully using TortoiseGit to your repository.
Regards,
Tom Jiang