BE 12.5 fills sec log with event 5152 during backup

[pinkpanther56]

Hi, I'm receiving loads of these events during backup using a remote agent. The backup works and verifies correctly and the service passwords check out ok. Can anyone else suggest what might be causing these errors, I think they're generated by the Server 2008 Firewall.

Event ID: 5152
Task Category: Filtering Platform Packet Drop
User: N/A

The Windows Filtering Platform blocked a packet.

Application Information:
	Process ID:		0
	Application Name:	-

Network Information:
	Direction:		Outbound
	Source Address:		IP of Agent Server
	Source Port:		0
	Destination Address:	IP of Media Server
	Destination Port:		0
	Protocol:		1

Filter Information:
	Filter Run-Time ID:	66095
	Layer Name:		ICMP Error
	Layer Run-Time ID:	32

I'm using Backup Exec 12.5 with all updates applied on Windows Server 2008 SP2.

Thanks.