Change vCenter 6.5 URIs / SSO redirect for vSphere Web Client

Hi,

im struggling with the Urls of the vSphere Web Client and want to change it.

For default vCenter uses the Server-Hostname, but i have an internal Loadbalancer and want to use another external Url, internally all goes to the original hostname (HOST-Header rewrite).

All works fine without SSL errors, but the Url of Single Sign On still stays on hostname.

It is exactly the same as in this discussion: https://communities.vmware.com/thread/514184 - But no solution works.

Everytime i click on "vSphere Client" on the Startpage it redirects me:

1. https://vcenter.fqdn/ui

2. https://vcenter.fqdn/websso/SAML2/SSOSSL?RelyingPartyEntityId=....

When i use my Loadbalancer all works except SSO:

1. https://vcenter.external.com/ui

2. https://vcenter.fqdn/websso/SAML2/....

Anyone can help or have a solution?

Thank you in advance.