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SubCA instead of RootCA for HTTPS Decryption

Greetings, 

I am getting ready to go live with HTTPS scanning & decryption, and one question that has come is why can't the Sophos XG use a SubCA for HTTPS decryption.

Our RootCA is offline, and we'd prefer to keep it that way...  I did get the SubCA cert loaded, and can *use* it for https decryption, but all I get is errors that the provider is not recognized.

The fallback is going to be to use the Sophos Appliance Certificate, but before moving forward I'd love to understand why a SubCA is no good.

 

Thanks in advance, 

Eric



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