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https://help.tallysolutions.com/docs/ts9rel54/ts9/tally_server_9_release_4-91.htm

Tally.Server 9 Release 4.91

Tally.Server Service stopped while saving vouchers recorded with large volume of inventory, resolved: In Tally.Server 9 environment, when a voucher containing numerous stock items was saved, Tally.Server Service stopped, and Tally.ERP 9 displayed the message Connection to Tally.Server lost and reconnect attempt failed. Error code 2/1.

Now, Tally.Server Service does not stop when such vouchers are saved.