Server 2008 DHCP Configuration

We have recently migrated our server from server 2003 DHCP to server 2008 R2 DHCP, there have been no issues however I am monitoring my firewall an I am noticing that computers from a certain zone are trying to use a netbios port. which is blocked and this is filling up the firewall logs

The Ports the clients are trying to use are 137, 138. The scope options that are configured are:
003 - Router
006 - DNS Server
015 - DNS server name
044 - Wins
046 - Wins Node type

Any thought why just these nodes are trying to use these ports and the clients in the other scopes are not?
OTNAdminAsked:
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MikeKaneCommented:
Do the scope options match the working scope options?
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OTNAdminAuthor Commented:
I am not sure what you mean by working scope options
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MikeKaneCommented:
Do any of the other scopes have these options set?
003 - Router
006 - DNS Server
015 - DNS server name
044 - Wins
046 - Wins Node type

If so look at them and compare the options to the scope that is not working properly.  

Make sure the the scope subnet and subnet masks are also setup correctly.    
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vivigattCommented:
IF the error is related to dhcp, and to some application or behavior on the related clients (which may try explicitly to open some netbios over tcpip connections to some specific hosts):
Check that all clients are using the same type of netbios nodes, and that they all have a working WINS server set.

Now if some clients do try to open a shared folder on another machine and this is not permited by your firewall, you will have these entries in your logs, whatever you do.
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