Session does not work in Opera and IE

[eluser]psharp[/eluser]
[quote author="Anjey" date="1330518986"]i have change only

Code:

$config['sess_expiration'] = 0; //

and session begin work . but why? in past there was no such problem. a few days ago in all my site's on codeigniter stop working session's in opera and IE.[/quote]

Interestingly, my CI project suffers from the same problems. On Feb. 29, it stopped working in IE and Opera but continued to work with Firefox and Chrome. Setting the $config['sess_expiration'] to 0 has allowed the site to continue to work but does not explain WHY it suddenly started to fail. I can find no significance in the date of Feb. 29, except for that is the day when I checked the sites with all browsers.

I've even started a new project from a CI base and installed only the tank_auth (www.konyukhov.com/soft/tank_auth/) libraries. This shows the same behavior where it will work on FF and Chrome, but fails on IE and Opera. I have not tried Safari yet.

These are the config file settings for sessions:

Code:

$config['sess_cookie_name']  = 'ci_session';
$config['sess_expiration']  = 0;
$config['sess_expire_on_close'] = FALSE;
$config['sess_encrypt_cookie'] = FALSE;
$config['sess_use_database'] = TRUE;
$config['sess_table_name']  = 'ci_sessions';
$config['sess_match_ip']  = FALSE;
$config['sess_match_useragent'] = TRUE;
$config['sess_time_to_update'] = 300;

Since this was a working installation for months previous and there was no active development with it, the date of Feb. 29th may indeed have something to do with it. Randomly changing the session configuration settings to "here, try this" values does not seem to be a very solid way of determining what is wrong here.

Does anybody else have this problem? Are there any other explanations as to why a working site "stopped", just because of a date change?