could somebody exaplain me where i can do this in SQL SERVER or WINDOWS SERVER?

how i can do it??

The SQL database mirroring account/group has been granted "Access this computer from the network". This will be the account (or group containing the account) under which database mirroring runs, and should be a service account/group. This needs to be done on all participating servers (principal, mirror, and witness).

1.Open up the Local Security Policy on the principal server

2.Expand Security Settings > Local Policies > User Rights Assignment

3.Grant the database mirroring service account "Access this computer from the network" permissions

thanks.