Plesk session is dropped if client’s IP is being changed

[abdi]

Plesk session is dropped if client’s IP is being changed, I followed all the instructions below but still ALL our servers cant login due to dynamic IP address of our ISP.

2. Insert the following record into the Plesk database, the ‘psa’ table, ‘misc’ database:
param='disable_check_session_ip', val='true'

Please help me .. what am I doing wrong? Its months now we fail to login to the damn servers ...