[Tickets #14008] Horde Invalid Token error causing "Error when communicating with the Server"

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Ticket URL: https://bugs.horde.org/ticket/14008
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  Ticket             | 14008
  Created By         | andre.paiz at iqm.unicamp.br
  Summary            | Horde Invalid Token error causing "Error when
                     | communicating with the Server"
  Queue              | IMP
  Version            | 6.2.7
  Type               | Bug
  State              | Unconfirmed
  Priority           | 3. High
  Milestone          |
  Patch              |
  Owners             |
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andre.paiz at iqm.unicamp.br (2015-06-10 19:18) wrote:

Dear Horde Team,

I have noticed this error on Internet Explorer and Google Chrome. I  
don't receive it from Mozilla Firefox, at least when I was testing.

Users start to complain that sometimes the "Error when communicating  
with the server" appears from nothing, even with the service working  
fine.
If the message appears with a new message window open, the user is  
forced to re-authenticate.

When I was simulating, the error appeared when I clicked "send" after  
typing a new message. On the second click, the message was correctly  
sent.

When the error appears, the horde.log contains the following error message:
2015-06-10T16:02:39-03:00 EMERG: HORDE [imp] Invalid token! [pid 32659  
on line 540 of "/usr/share/pear/Horde/Session.php"]

I'm working with CentOS 6 on both webmail and Imap servers.
The webmail server contains the imapproxyd daemon for faster authentication.
The IMAP server runs dovecot 2.0.9-8.el6_6.4.x86_64

I was browsing through the forum and I haven't found a similar  
situation with this error message.

Thank you.