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:
- Untick "requires client authentication" in your SoapUI Preferences under SSL Settings
- Close SoapUI and reopen it
- 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).