JVH Consulting's Blog

This happened to a client recently who had just signed up with Comcast Business account for their new office. After getting everything all set up, tried accessing several websites and found some worked while others did not with the error message “ERR_SSL_PROTOCOL_ERROR” in the picture below:

Tried restarting the comcast modem – no change; power cycling modem – no change.

Contacted Comcast (ISP) to speak with a Technician, found out that Comcast Business accounts are automatically enabling their Secure Firewall service that blocks certain sites and causes this error. Doh!!

Apparently to get this service disabled, the Comcast Technician has to do it from there end. There is nothing in the Firewall config of the comcast modem to disable it by the customer.

Cheers!