In case someone else is facing the same problem, I should have been more precise.
The parameter NLS_LANG had been defined within the registry-key HKEY_LOCAL_MACHINE\SOFTWARE\ORACLE\KEY_OraClient10g_home1 Although I've seen several machines defining it in the 'Home'-Section, it obviosly was not...
The problem is solved.
The parameter NLS_LANG was defined in the registry, but was somehow not accepted by Oracle-Net.
After defining the parameter as an environment-variable everything works fine.
With regards, Marco
Hello Marco,
you're perfectly right, SQL-Plus is acting strange too. So I have to change my directive to find the right parameters for the Oracle-Client.
Thanks, Marco