Why is the MetaDefender ICAP activation failing even if Activation URL is whitelisted?

Issue:

Activation attempts fail despite allowlisting the activation server. Logs indicate CRL lookup failures preventing SSL/TLS verification:

[WARNING] 2025.06.13 13:12:08.182: (common.licensemgr) Call http request failed, url='https://activation.dl.opswat.com/activation?…', error_code='35', error_ detail='schannel: next InitializeSecurityContext failed: CRYPT_E_REVOCATION_OFFLINE (0x80092013) - The revocation function was unable to check revocation because the revocation server was offline.' [msgid: 4885] 

Resolution:

There are two options to resolve this issue:

• Option 1: Allowlist CRL and OCSP URLs
• Option 2: Upgrade MetaDefender ICAP to Version 5.10

Steps:

Option 1: Allowlist CRL and OCSP URLs

Ensure the following Certificate Revocation List (CRL) and Online Certificate Status Protocol (OCSP) URLs are whitelisted in your network firewall or proxy settings:

• http://crl.r2m02.amazontrust.com/r2m02.crl
• http://crl.rootca1.amazontrust.com/rootca1.crl
• http://ocsp.rootca1.amazontrust.com
• http://crt.rootca1.amazontrust.com/rootca1.cer

Option 2: Upgrade MetaDefender ICAP to Version 5.10

1. Download the MetaDefender ICAP 5.10 installer from the OPSWAT Customer Portal.
2. Run the 5.10 installer and follow the wizard prompts.