UPDATE ......From Tuesday 8 April 2025 we have changed the way that Single Sign-on works on this wiki. Please see here for more information:
Update
There are two production instances of the Enterprise Service Bus (ESB) prod-esb01.geant.net (62.40.109.44 - Paris PoP) and prod-esb02.geant.net (62.40.113.83 - London PoP)