Windows firewall blocking dhcp server

Unfortunately it took more than a week for the appropriate channels to decide upon and approve the change. You must be logged in to post a comment.

Leave a Reply Cancel reply You must be logged in to post a comment. Posted May 07, AM. Find the policy that is associated with the group that contains the DHCP server. Right-click this policy and click Edit. Move the new rule above any other rules that would otherwise block DHCP server traffic. Click OK to apply the policy. Posted Sep 17, AM. Bascially I had created the correct rule in the firewall so that it would allow DHCP traffic to pass through, but the clients weren't updated with the most up to date policy.

So all I needed to do was to update each computer with the most recent policy. So in the firewall I created the rule to allow DHCP traffic and moved it to the top of the policy list.

Great Success!!!! Thanks to everyone that replied with responses. All were very helpful :D. This thread already has a best answer. Would you like to mark this message as the new best answer? The site is small about a dozen PCs, one thin client, 3 printers, one server.

Suddenly no-one was getting IPs from the server any more. Customer tried fixing it himself, spent days, eventually allocated fixed IPs, but not ideal as clients weren't always able to use the Web I discovered today this is because DNS requests were only intermittently successful. No events appear in the system event log, and when I switched on logging in DNS all requests appeared to be answered, but PCs were not receiving the answers, while the server itself was. When I turned off firewall, everything worked properly.

So my questions:- 1. Would you expect opening ports on the firewall to work? More importantly, why did it start blocking? Under the "advanced" config of the Firewall, there is a place to specify some of the services you want to allow on the server, but neither DHCP nor DNS appear there. I did try inserting them as new services but it made no difference that I could see. Tags: DHCP. All forum topics Previous Topic Next Topic.

Honored Contributor. Hi Chris, I don't have specific answers to your carefully constructed questions, but I can tell you that I have never needed to create an Windows Firewall exception for client access to a DHCP server.

Thanks Jay Oops I assigned points without testing the suggested remedy :- But: wow, that Technet publication you referred to is a great resource. Thanks for that - amazing what info is available out there if you just know where to look for it and how to filter all the cr p. Asked 3 years, 1 month ago. Active 3 years, 1 month ago. Viewed 1k times. Thank you for your help, Niels.

Improve this question. Niles Davis Niles Davis 21 2 2 bronze badges. So yes, such an incoming rule would be useful. That concept does not exist with UDP traffic. Ok thank you.