User lands on wrong page after SAML login

I am seeing the following issue:

A Domino web server has two names in DNS:

www.service.mydomain.com

domserver1.mydomain.com

The SAML login is configured for www.service.mydomain.com so that’s where ADFS sends them after the a successful login.

If a user clicks a link that looks like this:

www.service.mydomain.com/some/place/here.nsf

then all is good - they get sent to the ADFS login page, log in and get redirected to the correct page. However, if the user clicks a link like this:

domserver1.mydomain.com/some/place/here.nsf

then after they log in they end up on their homepage, e.g.

www.service.mydomain.com/portal/users1.nsf/Homepage

as if they had logged in through the homepage without following a link.

So basically, if the server has multiple names and you try to access it via a name other than that listed in the SAML configuration in idpcat.nsf/ADFS then links don’t work (unless you are already logged in).

Is there a way to configure Domino or ADFS so the links DO work?

Also note, I can’t redirect traffic from domserver1 to www.service prior to connection because one of the developers has implemented a production service which connects using the alternative name and won’t follow redirects.

Any suggestions greatly appreciated!