Joining Webinar timeout - using Web SDK

I am able to join a meeting using the Web SDK (ZoomMtg.join). But when i try to join with a webinar meeting id, it fails. It says Joining webinar timeout.

Error
Joining webinar timeout.
Your connection has timed out and you cannot join the webinar. Verify your network connectivity and try again.

I’m using Web SDK 1.7.7