Why is my_Keystore.jks not used for establishing the connection to HBS in SoapUI?

In SoapUI, my_keystore.jks is not used to establish the connection although it is defined in the settings. This is a bug in some SoapUI versions which can be fixed using the following workaround:

1. Untick "requires client authentication" in your SoapUI Preferences under SSL Settings
2. Close SoapUI and reopen it
3. Tick "requires client authentication" again, and close and reopen SoapUI

Alternatively, a newer version of SoapUI can be used (Version 5 or later for example -  issue is not being reported with these).