Steps to duplicate for GroupWise 18 running on Windows 2016 server: 1) Create an LDAP server of Active Directory Type and plug in all the details. 2) Select the SSL Tickbox and upload a certificate. 3) Click Okay. 4) Later, go back in and everything looks fine. 5) Click the "View" magnifying glass and see the Certificate details. 6) Click Okay, and get the error: "* SSL Certificate is Required." 7) It appears that even though the certificate is there, it doesn't recognize it when hitting okay (Like for example, if you went in to add a description or change any of the details. 8) Despite that error, you can still view the certificate and confirm it's there. The dialog just loses it.
Reported to engineering.