Too many read?

I am getting an error that I don't understand:
Establishing connection to imap.place.com:993 (ntlspamserv)
Enter password for account 'place': 
 LOGIN authentication failed: command: LOGIN => socket error: <type 'exceptions.IOError'> - Too many read 0
 ERROR: All authentication types failed:
	LOGIN: command: LOGIN => socket error: <type 'exceptions.IOError'> - Too many read 0
 *** Finished account 'ntlspam' in 0:14
ERROR: Exceptions occurred during the run!
ERROR: All authentication types failed:
	LOGIN: command: LOGIN => socket error: <type 'exceptions.IOError'> - Too many read 0

Traceback:
  File "/usr/share/offlineimap/offlineimap/accounts.py", line 283, in syncrunner
    self.__sync()
  File "/usr/share/offlineimap/offlineimap/accounts.py", line 359, in __sync
    remoterepos.getfolders()
  File "/usr/share/offlineimap/offlineimap/repository/IMAP.py", line 452, in getfolders
    imapobj = self.imapserver.acquireconnection()
  File "/usr/share/offlineimap/offlineimap/imapserver.py", line 558, in acquireconnection
    self.__authn_helper(imapobj)
  File "/usr/share/offlineimap/offlineimap/imapserver.py", line 431, in __authn_helper
    "failed:\n\t%s"% msg, OfflineImapError.ERROR.REPO)

-------------------------------------------------------------

I had a *very* quick look at some of the code. As far as I can see,
this is a response from the server, suggesting that it has hit some
sort of resource limit? Is that right?

I have tried several times from different machines with the same error.

What is odd is that I can connect ok using another email account on the 
same server. 

Have I misunderstood what is happening?

ael


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