As per BSNL Network team, due to recent malware attacks, some of the ports are blocked by BSNL for security reasons .
As per the instructions from NOC , for port opening the following details are required from affected customers .
1)Customer Name
2)Company
3)IP details (ILL /BB/FTTH )
4)Ports to be accessed and opened
5)Purpose of the access
6)whether access would be within the country or outside the country .
Kindly share the same .
Thats the answer i got from BSNL