ClientProtocolException since 4.5.1 upgrade.
Exception occuring when calling securised Web Service. Works fine in 4.5.0. SOAP UI Log Mon Jul 09 12:50:07 CEST 2012:INFO:nlbnetprd.cid.dom:80 requires authentication with the realm 'UserDataWe...
Forum Discussion
Also, if you haven't already, try running with "Pre-emptive authentication" (Preferences -> HTTP Settings) both checked and unchecked. For those experiencing the issue - are you behind a proxy?