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Mysterical DHCP / IP problems in SBS domain

Honored experts.

I am experiencing a really strange problem in my network which consists of a Small Business Server 2011 + 25 PC's running Windows 7 Pro.

Some of my users starts to complain that their pc was taking extremely long to start.
Others that they could access Outlook but not the shared network drives.
While this is going on other users did not experience any problems.

I tried to rejoin these computers to the domain which was not possible because they could not locate the domain controller.   If I configure these pc's with static ip addresses the problem was solved instantly!

I have examined DHCP server on my SBS without seing any issues.
Never the less I have a handfull random computers which are not able to optain DHCP address.

I have not changed any switches or routers.
This problem has been building up in a long time, but seems to get worse!

Can anyone point me in the right direction?
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9 Solutions
Miguel Angel Perez MuñozCommented:
Clients without lease of your DHCP, gets another IP or APIPA? maybe has another DHCP device on the net and clients are receiving ip from it.
Radhakrishnan RSenior Technical LeadCommented:

Have you checked whether the scope is full? on an affected machine, run ipconfig /all and see which ip it's getting?
Olaf De CeusterCommented:
Have you run : "Fix my network" wizard in Console>Networking?
Have you disables IPV6 ? If so re-enable
Are all problem machines connected to same switch.

If all above is irrelevant:
Try BPA:
Hope that helps,
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Brian PiercePhotographerCommented:
Check to see if the scope is exhausted - if it is then extend the scope - if possible http://support.microsoft.com/kb/255999

and reduce the lease time http://blogs.technet.com/b/teamdhcp/archive/2007/02/07/configuring-lease-time.aspx
OhmitAuthor Commented:
OK I have some additional information.

Its not that the DHCP server does not work - its far more strange!

Right now I am sitting with a pc which does ONLY work with a static ip.
If I configure this to obtain a dhcp it does that PERFECTLY exept that it can not go on the internet??

It gets the exact same ip info but it does not work - only when they are static entered???
Brian PiercePhotographerCommented:
Is DHCP giving the correct gateway and DNS server to the clients (do an IPCONFIG /all)
Radhakrishnan RSenior Technical LeadCommented:
Could you post the ipconfig /all result from an affected and non affected machines?

Also, make sure that the DNS and Default gateway has configured correctly in DHCP scope.
Perform a tracert google.com and see it resolving the DNS and contacting the outside network?

Do you have any firewall in the netowork? if so, make sure it's not blocking the particular range of IP's
Jeffrey Kane - TechSoEasyPrincipal ConsultantCommented:
Jeffrey Kane - TechSoEasyPrincipal ConsultantCommented:
Also, consider that your DHCP database may be corrupt.  Reinstalling DHCP will fix that.

(see http://www.experts-exchange.com/Windows_Server_2011/Q_27379458.html for reference)

Try to see if there is no DHCP rogue server.
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