explorer.exe tries to access 178.255.83.1 & 178.255.83.2

Comodo Internet Security - CIS Firewall Help - CIS
#1

Once in a while Comodo CIS alerts me that explorer.exe tries to communicate with 178.255.83.1 & 178.255.83.2
(which are Comodo ip adresses)

Can anyone shed some light on why explorer needs to communicate with Comodo please ? I can imagine, Comodo software wanting to communicate with Comodo but why explorer ? and should I allow or block it ?

I’m using Comodo CIS 6.3.302093.2976 on Windows 7.
I checked for virusses and malware and everything, including explorer.exe is fine.

thanx

#2

Looks like certificate revocation checking (requesting revocation lists from Comodo Certificate Authority).

178.255.83.1 - ocsp.comodoca.com (ocsp is ‘Online Certificate Status Protocol’)
178.255.83.2 - crl.comodoca.com (crl is ‘Certificate Revocation List’)

You’ll probably find explorer.exe does the same with other Certificate Authorities (such as Verisign) as well.

#3

Thank you ! I didn’t realize. Strange I didn’t notice before.