PSARC/2015/427 Old SunSSH Gss* Option Names in OpenSSH
21919790 add GSSKeyEx as an alias to GSSAPIKeyExchange in OpenSSH
LoadModule auth_gss_module libexec/mod_auth_gss.so
<IfModule auth_gss_module.c>
<Directory /krb5>
AuthType GSSAPI
ServiceName HTTP
KeytabFile /etc/apache2/2.4/http.keytab
GssDebug 1
Require valid-user
AllowOverride All
</Directory>
</IfModule>