In server, login to Tally ERP 9 as Admin user account.
Select SECURITY CONTROL... User Management... Users and Password..
Create a new Tally .NET user with server activation mail id..
Then please open Control Center..
Then select License Management..
In this windows , please check the company status as ACTIVE or not..
Please change to ACTIVE..
Press F4 for connect / dis connect from remote session..
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In client machine, login with remote tally user, using the mail id and password..
NB:- Need to open and login to Tally with admin account in Server for access it from remote..