Hi Steve,
I have seen the Report web part intermittently return 401 errors but never a 403 error. Is it always a 403?
The issue with the 401 error was related to Kerberos and the use of PreAuthentication when the web part calls the filterservice.asmx web service. If you are seeing intermittent 401 errors please open a ticket with K2 Support and they can assist.
Blake
The statements and opinions made in my postings are my own, and do not reflect the opinions of SourceCode Technology Holdings, Inc. or its subsidiaries. All information is provided as is with no warranties, express or implied, and grants no rights or licenses.