I had a unique problem that some websites not opening such as the Karnataka Government Websites.
E-mailed their support jioFibercare@jio.com - No Response even after 15 days.
Next E-mailed to appellate.kar@jio.com - No Response even after 30 days. Terrible Service.
After patiently waiting on calling their call center, finally, reached JioFiber customer care. And Suggested Solution was Switch Off the Router for 8 Hours. CC executive doesn't know why, but Jio does something in the backend and it works.