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As per suggested on possible causes
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Pop-up 'Revocation info for security certificate for this site not available. &nbsp;Do you want to proceed?&quot; &nbsp;What causes this and can you change a setting to trust the site so the popup does not come back. &nbsp;We also use a Sophos firewall and it seemed to start around that time. &nbsp;PC is a Windows 7 Professional and user has admin rights. &nbsp;Haven't had this issue with other users.
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Pop-up 'Revocation info for security certificate for this site not available.  Do you want to proceed?"  What causes this and can you change a setting to trust the site so the popup does not come back.  We also use a Sophos firewall and it seemed to start around that time.  PC is a Windows 7 Professional and user has admin rights.  Haven't had this issue with other users.

Revocation Info for Security Certificate

Security is the protection of information systems from theft or damage to the hardware, the software, and the information on them, as well as from disruption or misdirection of the services they provide. The main goal of security is protecting assets, and an asset is anything of value and worthy of protection.  Information Security is a discipline of protecting information assets from threats through safeguards to achieve the objectives of confidentiality, integrity, and availability or CIA for short. On the other hand, disclosure, alteration, and disruption (DAD) compromise the security objectives.