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https://help.tallysolutions.com/docs/te9rel64/Licensing/Error_Code_804.htm

Error Code 804

This error occurs when Tally.ERP 9 is unable to connect to the Tally Server.

Possible Reason for Failure

If the proxy configuration specified is incorrect, this error may occur.

Possible Solutions

Specify the correct proxy details in the Advanced Configuration screen.

After you have resolved the network issue you can:

Retry.