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Backup to CIFS Share fails with "Failed to call RPC function 'FcIsExists': The user name or password is incorrect."

Backup to CIFS Share fails with "Failed to call RPC function 'FcIsExists': The user name or password is incorrect."

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Backup Job targeting an SMB (CIFS) Repository fails with:

Error: Failed to call RPC function 'FcIsExists': The user name or password is incorrect.

When this occurs, attempting to Rescan the repository may fail with a similar error:

The password of the account specified within the Repository settings has changed.

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