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https://help.tallysolutions.com/docs/te9rel61/Licensing/Error_Code_802.htm

Error Code 802

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

Possible Reason for Failure

     If the Windows Firewall is blocking Tally.ERP 9, Tally Gateway Server, or both, this error may occur.

Possible Solution

     Allow Tally.ERP 9 and Tally Gateway Server through Windows Firewall. Click here, to know how to allow any application through Windows Firewall.

After you have resolved the network issue you can:

     Retry