Entering an invalid port number results in hanging "Connect to ServiceControl" dialog

[ramonsmits]

Describe the bug

Entering an invalid port number results in Unrecoverable Connect to ServiceControl dialog:

Steps to reproduce

Enter an url with an invalid port number like:

http://localhost:454443/api

Observe that the dialog hangs.

Workaround

Kill the ServiceInsight process and restart.

Relevant log output

No response

Additional Information

No response