@brunovgr it’s actually not a problem with certificates.
Strangely, when Factory I/O requests a session creation to the opc ua server, it passes it’s endpoint url with lower case letters.
This results into a url mismatch if the endpoint url is actually not in lower case. In this situation the session creation request is rejected.
About wether or not a url is case sensitive, the w3c states:
URLs in general are case-sensitive (with the exception of machine names). There may be URLs, or parts of URLs, where case doesn’t matter, but identifying these may not be easy. Users should always consider that URLs are case-sensitive.
https://www.w3.org/TR/WD-html40-970708/htmlweb.html
I believe Factory I/O should avoid transforming the endpoint url.
Do you know where I can create an issue?