Hi Andrew, in my current scenario the certificate was issued by the PKI infrastructure, but I've done some research and it is available also in OpenSSL as "trust settings": "A trusted certificate is an ordinary certificate which has several additional pieces of information attached to it such as the permitted and prohibited uses of the certificate and an "alias"." So, we are most likely talking about the X.509 certificate extensions as it is mentioned in the RFC 5280 (https://tools.ietf.org/html/rfc5280#section-4.2). That's all I was able to find. Hope it helps. Regards Martin ________________________________ Od: Andrew Zaborowski <andrew.zaborowski(a)intel.com&gt; Odesláno: sobota 20. června 2020 15:17 Komu: Martin Tesar <martin.tesar(a)yourwifi.cz&gt; Kopie: iwd(a)lists.01.org <iwd(a)lists.01.org&gt; Předmět: Re: Fw: Failed to load trusted user certificate Hi Martin, On Sat, 20 Jun 2020 at 14:51, Martin Tesar <martin.tesar(a)yourwifi.cz&gt; wrote: Right, we've seen this feature request somewhere recently and thought that it may be easy to support this format in IWD. Do you happen to know where this format is specified? Best regards