We have a site up and running with multiple domains. The site is for the Belgian market where the 3 native languages are supported, for each language at least one domain.

After a year in production we ran into some strange behavior concerning the domain names. We can visit the dutch domain and all dutch content is loaded. Umbraco recognizes the domain name.

Only are all the links on the pages to the German domain, if we delete the German domain name from the Culture and Hostnames, another random (other ) language domain is picked to create the links on the page.

We played with the order of the domains in Culture and Hostnames but didn't resolved the problem. A republish of the site and an IIS reset didn't resolved anything.

Once you have switched to another language and then switch back to the Dutch one, everything is rendered correctly, including the links.

Anyone any idea? Or some pointers how we can debug/search for the issue?