Using freeradius 1.0.2 with rlm_sql_postgres, all my users are defined in my DB and all my accounting is stored in this manner too. I have simultaneous-use set to 1. Only 1 user can login at a time! Let me present my case and then i will detail what i think is happening on my radius server. Firstly, my users have a problem when trying to login to my radius. Sometimes it lets then in first time, othertimes they need to try multiple times. So i tested the authentication by using the radtest tool locally with valid users on my system. Radius would respond with the following pattern: Access-Accept, Access-Accept, Access-Reject. (There has been some variations, but generally this pattern occured) When i do get a reject, radius spits out the "You are already logged in message". But i do notice that the reject radius reply from a radtest gives me a strange looking password [admin@rad ~]$ radtest trala@trala.com test localhost 1812 secret Sending Access-Request of id 202 to 127.0.0.1:1812 User-Name = "trala@trala.com" User-Password = "test" NAS-IP-Address = test.radman.com NAS-Port = 1812 rad_recv: Access-Accept packet from host 127.0.0.1:1812, id=202, length=20 [admin@rad ~]$ radtest trala@trala.com test localhost 1812 secret Sending Access-Request of id 206 to 127.0.0.1:1812 User-Name = "trala@trala.com" User-Password = "test" NAS-IP-Address = test.radman.com NAS-Port = 1812 rad_recv: Access-Accept packet from host 127.0.0.1:1812, id=206, length=20 [admin@rad ~]$ radtest trala@trala.com test localhost 1812 secret Sending Access-Request of id 210 to 127.0.0.1:1812 User-Name = "trala@trala.com" User-Password = "test" NAS-IP-Address = test.radman.com NAS-Port = 1812 Re-sending Access-Request of id 210 to 127.0.0.1:1812 User-Name = "trala@trala.com" User-Password = "\205t\2673VxL\214\264\255\212Lmu\214\337" NAS-IP-Address = test.radman.com NAS-Port = 1812 rad_recv: Access-Reject packet from host 127.0.0.1:1812, id=210, length=20 Heres my # Session database, used for checking Simultaneous-Use. Either the radutmp # or rlm_sql module can handle this. # The rlm_sql module is *much* faster session { #radutmp # # See "Simultaneous Use Checking Querie" in sql.conf sql } *My system works for a bit if i uncomment radutmp. about 30 mins if i have 20+- users active* Alan if you out there please give me some pointers! Regards, the aspiring radman.