Hello,
I have the same problem and reading this thread i`ve realized that in my case the problem is exactly the hostname in upper case while the domain name is lower.
I wanted to change it, simply keeping the same hostname but changing from upper to lower case, but i get a warning message which scares me a little bit. It is about the certificate, and in my deployment i have imported a public certificate for the Self-Registration portal. The warning message says that if i change the hostname i have to re-issue and import a new certificate. Do you know if the upper/lower cases affect the validity of the SSL Certificate? Can i change the hostname cases without re-issuing a new Certificate?
Thank you,
Regards!