Installation of Certificate in NOD32 Antivirus Software
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You can also watch a video tutorial at the following link video tutorial
It is necessary to completely eliminate the need of NOD32 to check security certificate:
Go to Advanced settings > Internet & Email > SSL/TLS > Enable protocol filtering SSL/TLS, Uncheck it.
Note that this setting will disable ESET's protection from untrusted certificates. When browsing via Netfree this protection is superfluous anyway since Netfree itself validates all certificates it encounters.