[imp] Frequent session timeout problem in IMP 3.1/Horde 2.1

[Stanley Yuen]

Dear all,

Our site is using IMP 3.1 and horde 2.1.    We found that some users here
had suffered from a session timeout problem very often.    Intially we
believed this was a session limit problem and we then changed the
corresponding values to the following:

session.gc_maxlifetime = 7200   ; garbage collection is now 2 hours
session.gc_probability = 1     ; percentage chance for gc each call
session.cookie_lifetime = 0     ; 0 means until browser restarted

But it did not solve his problem.   From the log file, we still found that
sessions would be expired in 15-30 minutes.  I tried to repeat this problem
here but, unfortunately, I could not.

Did any experts here encounter similar situation?   If yes, would you
suggest your solution on this?  BTW, session cookies has been enabled
already and we use file store IMP sessions, below please find a short
summary of Horde/IMP modules installed.

Would the problem be related to the session problem before PHP 4.3?    And
should we upgrade our IMP to 3.2.2 in order to solve this problem?

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Horde Versions
	Horde: 2.1 
	IMP: 3.1 (run IMP tests) 
	Turba: 1.1 
	Kronolith: 1.0 
	Mnemo: 1.0 
	Nag: 1.0 
PHP Version
	View phpinfo() screen 
	PHP Version: 4.2.2 
	PHP Major Version: 4.2 
	PHP Minor Version: 2 
	PHP Version Classification: release 
	You are running a supported version of PHP.
PHP Module Capabilities
	FTP Support: Yes 
	Gettext Support: Yes 
	IMAP Support: Yes 
	LDAP Support: Yes 
	MCAL Support: Yes 
	Mcrypt Support: Yes 
	MySQL Support: Yes 
	PostgreSQL Support: Yes 
	XML Support: Yes 
Miscellaneous PHP Settings
	short_open_tag enabled: Yes 
	magic_quotes_runtime set to Off: Yes 
	file_uploads enabled: Yes 
PHP Sessions
	Session counter: 1 
	To unregister the session: click here 
PEAR
	PEAR - Yes 
	Recent PEAR - Yes 
	Mail::RFC822 - Yes 
	Log - Yes 
	DB - Yes 
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Best regards,
Stanley Yuen

Information Technology Services Centre,
The Chinese University of Hong Kong,
Shatin, N.T., Hong Kong