Sorry the screenshot is in German however you will get the idea. After about an hour of messing around, I was able to download and save the certificate using Firefox (Edge or IE did not give me that option). My choice was to integrate a Citrix Access Gateway (CAG) mainly because we are using other product. Go into the Certificates section and locate the certificate you just added. The receiver authmanager logs we saw the https response does not have a server certificate set on it. Browser is reporting a certificate Once connected click the menu button at the top center of the screen to pull down all of your options. 2 did not support SHA-2) and make sure all the client PCs connecting had an OS supporting SHA-2. I am trying to connect to my server with the Mac Citrix Receiver. Citrix receiver certificate not trusted mac macOS is flagging Service Records as harmful because many companies and individuals are still using the legacy software.