Re: TNS 12638 at connect from Win95 Client to 8i Server

This error is caused by the NT server not being able to authenticate clients running on Windows 95. Windows 95 does not support doing the authentication "handshake" between itself and NT.

Short of changing Windows 95, there is no way to fix this if you want to connect as an externally identified user (connect "/"). However, if you want to connect as user who uses a password, you can add the following to your sqlnet.ora on the Windows 95 box:

sqlnet.authentication_services=(NONE)

That will prevent the handshake from being attempted.

                                          Rick

"G. L." <g.leitenbauer_at_mail.fhs-wels.ac.at> writes:

> I am trying out a Oracle 8i Installation.
> I can connect to a 8i server from a NT workstation, but when I try from
> a Win95 PC I always get the following error (logfile):
>
> Fatal NI connect error 12638, connecting to:
> (DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(PORT=1521)(HOST=apdc0001)))
>
> (CONNECT_DATA=(SID=UDB)(CID=(PROGRAM=C:\ORACLE\ORA81\BIN\SQLPLUS.EXE)
> (HOST=APC0003)(USER=leitenbauerg))))
>
> VERSION INFORMATION:
> TNS for 32-bit Windows: Version 8.1.5.0.0 - Production
> Windows NT TCP/IP NT Protocol Adapter for 32-bit Windows: Version
> 8.1.5.0.0 - Production
> Time: 02-NOV-99 08:59:23
> Tracing to file: c:\temp\sqlnet.trc
> Tns error struct:
> nr err code: 0
> ns main err code: 12638
> TNS-12638: Abrufen der ID-Daten gescheitert
> ns secondary err code: 0
> nt main err code: 0
> nt secondary err code: 0
> nt OS err code: 0
>
> The problem occurs at NA (authentication), as the trace file shows:
>
> ...
> nau_ccn: failed with error 12638
> nacomsd: entry
> nacomfsd: entry
> nacomfsd: exit
> nacomsd: exit
> nau_ccn: exit
> na_csrd: failed with error 12638
> ...
>
> Anyone got a tip for me?
>
>
> thanks in advance,
> Guenter
>

--

                                        Rick Wessman
                                        Security and Directory Technologies
                                        Server Technologies
                                        Oracle Corporation
                                        rwessman_at_us.oracle.com

       The statements and opinions expressed here are my own and do not
             necessarily represent those of  Oracle Corporation.