Anti-malware updates are not available

I have a problem getting updates for the anti-malware system in Exchange. The event log reads:

Event ID 6029

MS Filtering Engine Update process was unsuccessful in contacting the Primary Update Path. Update Path: http://forefrontdl.microsoft.com/server/scanengineupdate

The firewall (MS TMG) shows that two request for two .cab files is sent to what I assume are Akamai content servers (it does not reverse) since the IP on this http get request will change based on what forwarder I provide my internal DNS.

I also see a request for two Microsoft CRLs.

Are there any useful logs to look at to determine why this isn't working?

Regards,

Ola Pukstad