vCenter SA 6 redirect to wrong url

i have the following issue, when I access the ip http://10.0.0.15 of the vCenter the main page loads ok but when I click on Login to Web Client the url is wrong https://vcenter/websso/SAML2.....

I have tried a lot of things without success as changing the vcenter hostname, modifying some sso files. the vCenter was updated from v 5.5

Best regards, Ionut