Error attempting to connect to database:"ORA-02248 invalid option for alter session" (36958)

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Error attempting to connect to database:"ORA-02248 invalid option for alter session"
Description

When trying to connect to an Oracle database I encounter the following error:
"ORA-02248 invalid option for alter session"
Cause

This is caused by problems with the NLS_LANG settings on the database.
Resolution

Temporarily remove any Windows environment variable for NLS or NLS_LANG and retry connecting with Toad.

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