When open ArcMap or ArcCatalog get the following message " The internet site you are about to view uses a certificate that has expired or is not yet valid. Do you wish to proceed?" Is there a way to turn off that warning?

[DionO_Reilly]

Can this warning be turned off or how can it be resolved?

[RobertBorchert]

Renew the certificate

[Anonymous User]

You are essentially getting a message from Internet Explorer. Adding the site (like www.ArcGIS.com) to Trusted Sites should resolve the error message. 

How to add a website in browser's Trusted Sites in Windows OS? - Efforts Solutions IT