[Tickets #11159] IMP session exits if more than 292 folders

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Ticket URL: http://bugs.horde.org/ticket/11159
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  Ticket             | 11159
  Created By         | rnm at whoi.edu
  Summary            | IMP session exits if more than 292 folders
  Queue              | IMP
  Version            | 5.0.20
  Type               | Bug
  State              | Unconfirmed
  Priority           | 1. Low
  Milestone          |
  Patch              |
  Owners             |
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rnm at whoi.edu (2012-04-23 19:52) wrote:

I have a user with > 300 IMAP folders. When he clicks Folder  
Actions->Show All Folders, then tries to select a message from the  
message list, he is dropped out to the login screen. Message on the  
login screen after being kicked says "Your session has expired. Please  
login again."

I was able to reproduce the same behavior by creating a sub-folder  
called test with 300 subfolders below it. The problem seems to be  
associated with the total number of folders in the account, not an  
individual subfolder.

I'm running Horde-4.0.14, IMP-5.0.20. Backend is Cyrus IMAP. Session  
handler is SQL Database (MySQL).

Am I missing a setting in php.ini? I've tried bumping memory_limit (as  
far as 512M), post_max_size, etc to no avail.