sbs4.5 dhcp server service keeps falling

Check your boot partition for available space. More info is needed here though. Do you have high speed internet access? Does the event viewer give any hints as to why it shuts down? How large is the network? Is this a new problem, or has the DHCP service always done this? Try typing ipconfig/all at a client machine to determine the status of the DHCP server- and when it does go down, are you getting a lease from anywhere else? Anyways- maybe this help- maybe not. But check into those questions and you'll probably discover the answer on your own.

Another issue to check is that the DHCP server must have a fixed IP address. The server cannot itself be a DHCP client. And as Answer 1 states, you should be getting error messages in your system log. It will help us give you a more definitive answer if you can pass that type of information on when asking a question.

A DHCP server on a network using Active Directory must be authorized in Active Directory before it can function.

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