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/ip firewall filter 
add action=reject chain=forward comment=block_Win_Update content=update.microsoft.com reject-with=icmp-network-unreachable 
add action=reject chain=forward comment=block_Win_Update content=download.microsoft.com reject-with=icmp-network-unreachable 
add action=reject chain=forward comment=block_Win_Update content=download.windowsupdate.com reject-with=icmp-network-unreachable 
add action=reject chain=forward comment=block_Win_Update content=wustat.windows.com reject-with=icmp-network-unreachable 
add action=reject chain=forward comment=block_Win_Update content=stats.microsoft.com reject-with=icmp-network-unreachable 
add action=reject chain=forward comment=block_Win_Update content=ntservicepack.microsoft.com reject-with=icmp-network-unreachable 
add action=reject chain=forward comment=block_Win_Update content=windowsupdate.com reject-with=icmp-network-unreachable

/ip firewall filter add action=reject chain=forward comment=block_Win_Update content=update.microsoft.com reject-with=icmp-network-unreachable add action=reject chain=forward comment=block_Win_Update content=download.microsoft.com reject-with=icmp-network-unreachable add action=reject chain=forward comment=block_Win_Update content=download.windowsupdate.com reject-with=icmp-network-unreachable add action=reject chain=forward comment=block_Win_Update content=wustat.windows.com reject-with=icmp-network-unreachable add action=reject chain=forward comment=block_Win_Update content=stats.microsoft.com reject-with=icmp-network-unreachable add action=reject chain=forward comment=block_Win_Update content=ntservicepack.microsoft.com reject-with=icmp-network-unreachable add action=reject chain=forward comment=block_Win_Update content=windowsupdate.com reject-with=icmp-network-unreachable