Ocsp.ams1.verisign.com (Verisign Global Registry)

This domain is trying to access my computer this morning.  I blocked and then tried to research.  Is this a website linked with Norton?  I was able to get to a Norton page saying "SSL Certificates - Secure your Website with a Symantec SSL Certificate and Extended Validation formerly from Verisign | Symantec.

Should I allow this domain access and if so, what does it do?

 

Thanks,

Dawson