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Firefox blocks dns rewrites - MOZILLA_PKIX_ERROR_SELF_SIGNED_CERT

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Hi, recently I setup a home server for my local lan. Through the use of AdGuardHome and Nginx Proxy Manager, I have attempted to redirect websites I wish to avoid (in this case adult websites). The problem is that Firefix gives the error code MOZILLA_PKIX_ERROR_SELF_SIGNED_CERT and won't allow me to create an exception. As an example, i've tried redirecting google.com to duckduckgo.com. I've looked up solutions to this but nothing has helped. Thanks

Hi, recently I setup a home server for my local lan. Through the use of AdGuardHome and Nginx Proxy Manager, I have attempted to redirect websites I wish to avoid (in this case adult websites). The problem is that Firefix gives the error code MOZILLA_PKIX_ERROR_SELF_SIGNED_CERT and won't allow me to create an exception. As an example, i've tried redirecting google.com to duckduckgo.com. I've looked up solutions to this but nothing has helped. Thanks