Login Problem as SYSDBA ORA-01031 I have the following problem:
I can connect to an Orcale database as normal user or as sysdba:

sqlplus myuser/myPw@myDB

sqlplus "sys/sysPw@myDB as sysdba"


But when another (Windows-User) is logged on, he could only use

sqlplus myuser/myPw@myDB


With 

sqlplus "sys/sysPw@myDB as sysdba"


he gets the error:


  SQL*Plus: Release 9.2.0.1.0 - Production on Do Sep 29 12:10:07 2011
  
  Copyright (c) 1982, 2002, Oracle Corporation.  All rights reserved.
  
  ERROR: ORA-01031: Nicht ausreichende Berechtigungen.


I even tried full qualified paths to sqlplus with the same result.

Edit:

I see the possibility that different windows users use different (windows-) environment variables, especially different PATH variables. 
Further I see the possibility that some windows dlls could have wrong security settings and can not be accessed by one of the users.

But I do not see, how this could make an Oracle user, ( SYS in this case ) behave differently.

2nd Edit:

I checked that the Path variable is a system variable, i.e. both windows logins use the same paths.
Have you checked your ORAPWD file? Maybe the initial originator of the database set entries=1. That would allow 1 user to logon as SYSDBA and the second user would not be able to logon as SYSDBA. Just a thought  ;-)