[Asterisk-Users] FWD trouble - 407 error

[Iain Stevenson]

I got this today trying to place a call through FWD:

  SIP/2.0 407 Proxy Authentication Required
 Via: SIP/2.0/UDP 217.11.11.1:5060;branch=z9hG4bK230f856c
  From: "Iain" <sip:12345 at fwd.pulver.com>;tag=as6eaa85fb
  To: <sip:10001 at fwd.pulver.com>;tag=b27e1a1d33761e85846fc98f5f3a7e58.3701

I didn't used to have any trouble with FWD and * is registering with FWD 
OK.  Has FWD changed or * changed in a way that might cause this error?

  Iain