I'm pooped. I'll apologise in advance that there doesn't seem enough info. In this email, but the setup is so complex that to put it all in would exceed the mailing list message size :) (and to tell the truth, I'm hoping that someone can point a finger at a likely spot). I really like CST, but if this doesn't work, I'm thinking about using SQLSession as I'm really getting out of my depth here. Any thoughts would be really appreciated. I've got a ZEO system set up using this HowTo (which is very good BTW) 1) http://dev.zope.org/Members/dshaw/AdvancedSiteSetup Then I installed BerkeleyStorage from a combination of 2) http://www.zope.org/Members/Duncan/BerkeleyStorage and 3) http://www.zope.org/Members/andyd/zopeberkeleydb Then following the instructions at 4) http://www.zope.org/Members/randy/ZEO-Sessions I set up a ZEO based CoreSessionTracking system and set up several client zope systems (from (1)) and had them accessed 'randomly' using Apache rewriterules. I managed to get the system up and running. But once I 'invalidate' a CoreSession, I get this error message; Error Type: CorruptedDataError Error Value: data_container/manage_container Traceback: <!-- Traceback (innermost last): File /home/nnle/Zope-2.4.0-src/lib/python/ZPublisher/Publish.py, line 223, in publish_module File /home/nnle/Zope-2.4.0-src/lib/python/ZPublisher/Publish.py, line 187, in publish File /home/nnle/Zope-2.4.0-src/lib/python/Zope/__init__.py, line 226, in zpublisher_exception_hook (Object: RoleManager) File /home/nnle/Zope-2.4.0-src/lib/python/ZPublisher/Publish.py, line 171, in publish File /home/nnle/Zope-2.4.0-src/lib/python/ZPublisher/mapply.py, line 160, in mapply (Object: logout) File /home/nnle/Zope-2.4.0-src/lib/python/ZPublisher/Publish.py, line 112, in call_object (Object: logout) File /home/nnle/Zope-2.4.0-src/lib/python/Products/UserDb/UserDb.py, line 334, in logout (Object: RoleManager) File /home/nnle/Zope-2.4.0-src/lib/python/OFS/DTMLMethod.py, line 194, in __call__ (Object: docLogout) File /home/nnle/Zope-2.4.0-src/lib/python/DocumentTemplate/DT_String.py, line 544, in __call__ (Object: docLogout) File /home/nnle/Zope-2.4.0-src/lib/python/DocumentTemplate/DT_Util.py, line 230, in eval (Object: session_info.getSessionData().invalidate()) (Info: session_info) File <string>, line 2, in f (Object: guarded_getattr) File /home/nnle/Zope-2.4.0-src/lib/python/Products/CoreSessionTracking/SessionDat aManager.py, line 228, in getSessionData (Object: session_info) File /home/nnle/Zope-2.4.0-src/lib/python/Products/CoreSessionTracking/SessionDat aManager.py, line 323, in _getSessionDataObject (Object: session_info) File /home/nnle/Zope-2.4.0-src/lib/python/Products/CoreSessionTracking/AutoExpire Mapping.py, line 235, in get (Object: session_data_container) File /home/nnle/Zope-2.4.0-src/lib/python/Products/CoreSessionTracking/AutoExpire Mapping.py, line 221, in __getitem__ (Object: session_data_container) File /home/nnle/Zope-2.4.0-src/lib/python/Products/CoreSessionTracking/AutoExpire Mapping.py, line 154, in _getCurrentBucket (Object: session_data_container) File /home/nnle/Zope-2.4.0-src/lib/python/ZODB/Connection.py, line 519, in setstate File /home/nnle/Zope-2.4.0-src/lib/python/ZODB/FileStorage.py, line 587, in load (Object: /home/nnle/ZEO_FARM/SessionData.fs) File /home/nnle/Zope-2.4.0-src/lib/python/ZODB/FileStorage.py, line 568, in _load (Object: /home/nnle/ZEO_FARM/SessionData.fs) CorruptedDataError: (see above) --> Versions Solaris 8 Python 2.1 Zope 2.4.0 src Berkeley3.2 CoreSessionTracking 0.8 -- Dr Tony McDonald, Assistant Director, FMCC, http://www.fmcc.org.uk/ The Medical School, Newcastle University Tel: +44 191 243 6140 A Zope list for UK HE/FE http://www.fmcc.org.uk/mailman/listinfo/zope