I am regularly getting tracebacks of the following type in error.log. The effect of this seems to be that responses to my invitations are not processed and deleted from the mailbox. I am using the FreeBSD port under FreeBSD11.

cal# pkg info|grep calendarserver

py27-calendarserver-9.0 Calendar and Contacts Server from Apple (RFC 4791, RFC 6352)
cal# freebsd-version -ku
11.0-RELEASE-p2
11.0-RELEASE-p5

2017-07-14T01:39:54+0000 [caldav-0] [txdav.caldav.datastore.scheduling.imip.inbound.IMAP4DownloadProtocol#debug] IMAP servergreeting
2017-07-14T01:39:54+0000 [caldav-0] [txdav.caldav.datastore.scheduling.imip.inbound.IMAP4DownloadProtocol#debug] IMAP logged in
2017-07-14T01:39:54+0000 [caldav-0] [txdav.caldav.datastore.scheduling.imip.inbound.IMAP4DownloadProtocol#debug] IMAP Inbox selected
2017-07-14T01:39:54+0000 [caldav-0] [twisted.internet.defer#critical] Unhandled error in Deferred:
2017-07-14T01:39:54+0000 [caldav-0] [twisted.internet.defer#critical]
2017-07-14T01:39:54+0000 [caldav-0] Traceback (most recent call last):
2017-07-14T01:39:54+0000 [caldav-0] File "/usr/local/lib/python2.7/site-packages/twisted/mail/imap4.py", line 2608, in _defaultHandler
2017-07-14T01:39:54+0000 [caldav-0] cmd.finish(rest, self._extraInfo)
2017-07-14T01:39:54+0000 [caldav-0] File "/usr/local/lib/python2.7/site-packages/twisted/mail/imap4.py", line 428, in finish
2017-07-14T01:39:54+0000 [caldav-0] d.callback((send, lastLine))
2017-07-14T01:39:54+0000 [caldav-0] File "/usr/local/lib/python2.7/site-packages/twisted/internet/defer.py", line 459, in callback
2017-07-14T01:39:54+0000 [caldav-0] self._startRunCallbacks(result)
2017-07-14T01:39:54+0000 [caldav-0] File "/usr/local/lib/python2.7/site-packages/twisted/internet/defer.py", line 567, in _startRunCallbacks
2017-07-14T01:39:54+0000 [caldav-0] self._runCallbacks()
2017-07-14T01:39:54+0000 [caldav-0] --- <exception caught here> ---
2017-07-14T01:39:54+0000 [caldav-0] File "/usr/local/lib/python2.7/site-packages/twisted/internet/defer.py", line 653, in _runCallbacks
2017-07-14T01:39:54+0000 [caldav-0] current.result = callback(current.result, *args, **kw)
2017-07-14T01:39:54+0000 [caldav-0] File "/usr/local/lib/python2.7/site-packages/txdav/caldav/datastore/scheduling/imip/inbound.py", line 692, in cbGo
tSearch
2017-07-14T01:39:54+0000 [caldav-0] self.fetchUID(ms).addCallback(self.cbGotUIDs)
2017-07-14T01:39:54+0000 [caldav-0] File "/usr/local/lib/python2.7/site-packages/twisted/mail/imap4.py", line 3494, in fetchUID
2017-07-14T01:39:54+0000 [caldav-0] return self._fetch(messages, useUID=uid, uid=1)
2017-07-14T01:39:54+0000 [caldav-0] File "/usr/local/lib/python2.7/site-packages/twisted/mail/imap4.py", line 4023, in _fetch
2017-07-14T01:39:54+0000 [caldav-0] assert isinstance(messages, bytes), messages
2017-07-14T01:39:54+0000 [caldav-0] exceptions.AssertionError: 4:68
2017-07-14T01:39:54+0000 [caldav-0]

dovecot does believe logins are occurring, which accords with calendarserver’s logging.

Any clues, pointers, or debugging hints?

Joe