Sounds like when they changed the IP address they forgot that the SQL-API restricts access to the IP addresses which are allowed access to the SQL-API. It's a protection system against unauthorised hacking of the system, and they've locked the system out with it I think.
@UKCT Server Admins
Guys, cant recall the details from here at work - but it's in the remarks at the top of the SRA 1 version of the source.
You need to grant the servers new IP address access to the API - I think, in fact i'm sure, the servers old IP was hard coded and you can only edit the remote IP with that script - but it'll get you out of hot water.