topic Re: Harmony EndPoint Protection Blocking Access to DigiCert Certificate Revocation List in Threat Exposure Management

Harmony EndPoint Protection Blocking Access to DigiCert Certificate Revocation List

ccsjnw — Thu, 21 May 2026 17:14:41 GMT

Recently (last couple of weeks), I am seeing Harmony EndPoint Clients getting blocked when they try to access: rb.symcb.com/rb.crl

This site belongs to DigiCert (it was formerly owned by Symantec, but DigitCert took over Symantec's CA business).

The address is specifically used to revoke bad certificates (CRL is the Certification Revocation List).

In light of the recently incident where DigiCert were compromised by a bad actor, and issued code-signing certificates that have since been used to make Malware look legitimate, I think it's important that clients are able to access the CRL list.

This is a recent problem – I’ve only seen this site being blocked for the last couple of weeks…
Our policy has blocked the category of Software Downloads for a long time, so this isn't a symptom of a recent policy change at our end.

Has anyone else encountered this problem?

Re: Harmony EndPoint Protection Blocking Access to DigiCert Certificate Revocation List

Lesley — Thu, 21 May 2026 17:49:34 GMT

False positives you can report here and Check Point will take a look and change it if needed.

In the future you can report it here (login needed) https://usercenter.checkpoint.com/ucapps/urlcat/

I just asked CP to take a look:

Thank you for submitting your category change request.

We will process your request and notify you by email (to lesley) when it is handled. You can check the request status online using the provided reference ID.

Reference ID:

URL: http://rb.symcb.com/rb.crl

Suggested Category: Computers / Internet

Comment: This is a crl list

While your request is being handled, you can manually override URL categories or create a custom application. This lets you override the information in the URL Filtering database and the responses generated by Check Point's online web service.

Re: Harmony EndPoint Protection Blocking Access to DigiCert Certificate Revocation List

Lesley — Thu, 21 May 2026 20:35:03 GMT

Fixed: