I am getting an error in the Houdini Licence Administrator "Couldn't resolve host name".

This happened after I was connected to a different network, perhaps this created a conflict?

Reinstalling Houdini does not fix the licences/server connecting.

EDIT: OK the problem was OSX had changed my hostname after I connected to another network. The solution was to change it back to the old one. To prevent OSX doing ths:
https://www.sidefx.com/faq/question/osx-and-the-licenses-have-stopped-working/ [www.sidefx.com]