Hi all, I have tried all my best to solve this problem for over 2 weeks with no good result and I am seriously in need of your help. I am aware that many people has got it working but why mine is problem? I checked radauth.txt and follow the instruction but still can't get it to work.. I am using radius + Mysql for authen and accounting. When I tried to register with gnugk I always receive message "PDU received from 192.168.1.111:1812 has invalid response authenticator". I tried to debug the message but nothing was displayed. I tried NTRadPing and I got response as follows: : response: Access-Accept -----------------------attribute dump---------------------- vendor cisco cisco-avpair=h323-ivr-in=terminal-alias:fred2; My gnugk.ini is as follows: [Gatekeeper::Main] Fourtytwo=42 Name=OpenH323gk Home=192.168.1.111 StatusPort=7000 [RouteMode] GKRouted=1 H245Routed=1 CallSignalPort=1721 CallSignalHandlerNumber=1 RemoveH245AddressOnTunneling=0 AcceptNeighborsCalls=1 AcceptUnregisteredCalls=0 SupportNATedEndpoints=1 DropCallsByReleaseComplete=1 RemoveCallOnDRQ=1 SendReleaseCompleteOnDRQ=1 #ScreenDisplayIE= #ScreenCallingPartyNumberIE= #ScreenSourceAddress= #ForwardOnFacility=1 #ShowForwarderNumber=1 #Q931PortRange=20000-20999 #H245PortRange=30000-30999 ConnectTimeout=180000 [GkStatus::Auth] rule=allow [Gatekeeper::Auth] RadAuth=required;RRQ,ARQ #RadAuth=sufficient;RRQ #RadAuth=optional;ARQ default=allow # Configuration section for RadAuth authenticator module [RadAuth] Servers=192.168.1.111 #LocalInterface=localhost RadiusPortRange=10000-11000 DefaultAuthPort=1812 SharedSecret=testing123 RequestTimeout=2000 IdCacheTimeout=9000 SocketDeleteTimeout=60000 RequestRetransmissions=2 RoundRobinServers=1 AppendCiscoAttributes=1 IncludeTerminalAliases=1 IncludeEndpointIP=1 Regards, Muki ------------------------------------------------------- This SF.Net email is sponsored by: Sybase ASE Linux Express Edition - download now for FREE LinuxWorld Reader's Choice Award Winner for best database on Linux. http://ads.osdn.com/?ad_id=5588&alloc_id=12065&op=click _______________________________________________________ List: Openh323gk-users@xxxxxxxxxxxxxxxxxxxxx Archive: http://sourceforge.net/mailarchive/forum.php?forum_id=8549 Homepage: http://www.gnugk.org/