For my case, I have SIEM (Qradar Threat Intel app) and try to get the feed from Minemeld which providing the output node in STIX/TAXII format. As I understand, I need to have the Minemeld cert for TAXII server. Please correct me if im wrong.
are you using "MineMeld Community edition" or "Autofocus Hosted MineMeld"? In the second case, you just need to import the GoDaddy certificate described in the article you mentioned.
In the second case, you must issue a new valid certificate for MineMeld (you can't use the self-signed default one) and import the CA used into QRADAR's trusted CA list. The article I shared with you describes how to replace default self-signed certificates with valid ones.
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