I contacted IBM support, and they said I have to explicitly add the fully-qualified name to every browser. They didn't say why the short name works without doing anything special.

From: Justin Taylor
Sent: Wednesday, September 12, 2018 4:35 PM
To: WEB400 (web400@xxxxxxxxxxxx) <web400@xxxxxxxxxxxx>
Subject: Fully-qualified name & Kerberos

I use Kerberos authentication for my Apache server that hosts my CGI apps. The URL's use the unqualified hostname (e.g. http://myHost/<http://my_host/>).

I'm now trying to set up HTTPS. I already have an SSL cert, but the tricky part is that the cert is for myHost.domainName.com (I didn't do it, and I didn't have any say in the matter). If I try https://myHost/<https://my_host/>, it gives me a cert error, due to the name mismatch. If I try https://myHost.domainName.com<https://my_host.domain_name.com>, FF gives "Authentication Required", while Chrome & IE prompt for a login.

I tried the fully-qualified name in iNav, and Kerberos worked perfectly.

Any thoughts?

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