Hi All Any one have an Idea about this problem , I changed the account priodic update in my NASes to be 25 Min , and all works good except when a session starts , I found in Acc Start time : 2008-09-28 03:58:56 and Acc Stopt time : 0000-00-00 00:00:00 And this is good , After a period I found the below Acc Start time : 2008-09-28 03:58:56 and Acc Stopt time : 2008-09-28 03:58:56 although the customer is connected and the accounts work good , This is what appears on the radius radaccount txt files , Sun Sep 28 03:58:56 2008 Acct-Session-Id = "000008C7" Framed-Protocol = PPP Acct-Authentic = RADIUS User-Name = "testuser" Acct-Status-Type = Start NAS-Port-Type = Virtual NAS-Port = 0 Service-Type = Framed-User NAS-IP-Address = 10.1.1.158 Acct-Delay-Time = 0 Client-IP-Address = 10.1.1.158 Acct-Unique-Session-Id = "5fe4d7463e8b93f8" Timestamp = 1222567136 Sun Sep 28 04:23:24 2008 Acct-Session-Id = "000008C7" Framed-Protocol = PPP Framed-IP-Address =62.139.42.151 Acct-Session-Time = 1468 Acct-Input-Octets = 23642 Acct-Output-Octets = 18730 Acct-Input-Packets = 536 Acct-Output-Packets = 367 Acct-Authentic = RADIUS User-Name = "0402882105-assas" Acct-Status-Type = Interim-Update NAS-Port-Type = Virtual NAS-Port = 0 Service-Type = Framed-User NAS-IP-Address = 10.1.1.158 Acct-Delay-Time = 0 Client-IP-Address = 10.1.1.158 Acct-Unique-Session-Id = "5fe4d7463e8b93f8" Timestamp = 1222568604 Notice : I didn't make any changes in radacct table as the default value for all accstart time and accstop time is 0000-00-00 00:00:00 AcctStartTime datetime No 0000-00-00 00:00:00 <http://tbl_alter.php?db=radius&table=radacct&token=e6bf77f29ce5708c69a2619802fdb7b5&goto=tbl_structure.php&back=tbl_structure.php&field=AcctStartTime> AcctStopTime datetime No 0000-00-00 00:00:00 Waiting your reply as soon as possible , Regards