List, (win95, PO 803) i posted this problem earlier also...and i have some more tracing to share... here's the situation... i installed 16bit oracle executables, plus31 under home c:\orawin on win95 I CAN connect to all my DB's (on AIX machine) using plus31 without any problems... then i installed PO 803 under home c:\orawin95, i confugured the TCP listener and I CAN connect using the sqlplus alias installed under c:\orawin95 home (plus80), with or without using TNS alias but I CANNOT connect using plus31 (installed earlier under c:\orawin) i turned on the tracing (at lever 16 !) and found errors reported .... how to interpret this trace... Regards Rahul ---+----+----+----+----+-------+----+----+----+----+---- nttcni: trying to connect to socket 5. ntt2err: entry -<ERROR>- ntt2err: soc 5 error - operation=1, ntresnt[0]=505, ntresnt[1]=60, ntresnt[2]=0 ntt2err: exit nttcon: exit -<ERROR>- nserror: nsres: id=0, op=65, ns=12535, ns2=12560; nt[0]=505, nt[1]=60, nt[2]=0 -<ERROR>- nsopen: unable to open transport nsmfr: 272 bytes at 0x40af5cfe nricall: Failed to copy originating community name value binding nricall: Exiting NRICALL with following termination result -1 nricall: exit -<ERROR>- osnqper: error from nricall -<ERROR>- osnqper: nr err code: 12206 -<ERROR>- osnqper: ns main err code: 12535 -<ERROR>- osnqper: ns (2) err code: 12560 -<ERROR>- osnqper: nt main err code: 505 -<ERROR>- osnqper: nt (2) err code: 60 -<ERROR>- osnqper: nt OS err code: 0 osnqme: entry osnqme: reporting ns (2) error: (12535) as rdbms err (12535) osnqme: exit -<ERROR>- osntns: Couldn't connect, returning 12535 sntrf: The following protocol adaptor DLL does not exist on your machine:ntm sntrf: The following protocol adaptor DLL does not exist on your machine:ntat sntrf: The following protocol adaptor DLL does not exist on your machine:ntc ---+----+----+----+----+-------+----+----+----+----+---- -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: Rahul INET: [EMAIL PROTECTED] Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051 San Diego, California -- Public Internet access / Mailing Lists -------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).