Error code accessing the COMMUNITY webpage

When I tried logging on to the community page, I got this error (in firefox):
An error occurred during a connection to community.homestead.com. Peer's Certificate has been revoked. (Error code: sec_error_revoked_certificate)

I worked around it by disabling a setting for my browser, but do not like having this option disabled as it makes my computer vulnerable. Can you please address this? Thank you.