The redirects are set up in Admin Tools on domain-old.com
The redirect results in the correct link in the browser.
For example, "https://domain-old.com/index.php/publications" results in the browser showing"https://domain-new.com/index.php/publications"
However the redirects fail with an error " The page isn’t redirecting properly. An error occurred during a connection to www.domain-new.com. This problem can sometimes be caused by disabling or refusing to accept cookies."
Interestingly, trying "https://domain-new.com/index.php/publications" in a different browser also fails with the same message.
Also and weirdly, removing the redirect from AdminTools in www.domain-old.com restores the ability for www.domain-new.com to be able to respond to "https://domain-new.com/index.php/publications"
This works for any redirect and any setting of url parameters.
I welcome your advice.
Many thanks,
Terence