IRCTC please disable ip based filtering

Please some one raise a concern with IRCTC to disable ip based filtering, ask them to filter based on account only.

Sent a mail to IRCTC this is the reply from IRCTC

We would like to inform you that in GPRS/proxy connections, service  provider provides their internet services to the multiple users on one IP
address. It might be another user who had booked their ticket before your attempt and due to this reason you are getting this error.

Customer can booked only 2 tatkal tickets bt 10-12 pm (per IP).