If you had local connection (same subnet) connection to a DC and DNS then I can't think of any reason why your problem would occur ....It's also strange that the DHCP server was serving to its own subnet and not to others.
I would just it put it down to a 'one off' and wouldn't be too concerned. If you could do a switch bounce again and test it then fine. Out of interest, what else runs on the DHCP server? -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Charlie Kaiser Sent: 02 November 2004 00:47 To: [EMAIL PROTECTED] Subject: RE: [ActiveDir] DHCP authorization problem 1. Yes. 2. Yes. 3. Cisco 3640 and 2620s, with a 4006 core switch doing Layer 3 routing. 4. Cleanup on the configs, code updates, additional security; stuff like that. We went over the configs this AM and everything looked fine, and once I restarted DHCP, all the subnets got addresses just fine. 5. Yes. I check that one regularly. :-) I don't even mind that the DHCP server unauthorized, but it would have been nice if it could reauthorize, or at least show me something that indicated it had unauthorized. When I looked in the MMC, it gave me an option to unauthorize, so I assumed (I know) it was still authorized. Made a stupid mistake, though; I didn't check the system log when I realized we had a problem. Would have found it much faster. Is the unauthorizing when DC comms go down behavior by design? ********************** Charlie Kaiser MCSE, CCNA Systems Engineer Essex Credit / Brickwalk 510 595 5083 ********************** > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of > Robert Rutherford > Sent: Monday, November 01, 2004 3:45 PM > To: [EMAIL PROTECTED] > Subject: RE: [ActiveDir] DHCP authorization problem > > A few question.... completely firing in different directions > but may lead to a cause :- > > 1) I take it your routers are relaying DHCP, not agents? > 2) Is there a local DC in the same subnet as the DHCP server? > 3) What are the routers? I've seen different routers play > games with DHCP relays. > 4) What was the maintenance? > 5) Are all your DCs running clean on DCDIAGS ( I know I > always ask that question, but identifies obvious config > issues at times) > > Rob > > ________________________________ > > From: [EMAIL PROTECTED] on behalf of Charlie Kaiser > Sent: Mon 01/11/2004 21:23 > To: [EMAIL PROTECTED] > Subject: [ActiveDir] DHCP authorization problem > > > > I had an odd one over the weekend. We did some network > maintenance that > included a core switch bounce. Down for about 5 minutes. We found out > this morning that DHCP wasn't working on any subnets except > for the one > that the DHCP server was on. We had made switch and router code and > config changes, so we looked to that as a solution, but with > no success. > I remembered something from a while back where I had a similar problem > and restarted the DHCP service. This corrected the issue. Apparently, > the DHCP server had lost authorization from AD when the core > switch went > down. Event ID 1059; "The DHCP service failed to see a > directory server > for authorization." I would have expected it to reauthorize once > connectivity was restored, however. But it didn't. I had to > restart the > service manually. > Is this normal? I would expect that DHCP authorization would > be able to > recover from a short loss of connectivity. > Any pointers to a way to prevent this from happening again? > Thanks! > > ********************** > Charlie Kaiser > MCSE, CCNA > Systems Engineer > Essex Credit / Brickwalk > 510 595 5083 > ********************** > List info : http://www.activedir.org/mail_list.htm > List FAQ : http://www.activedir.org/list_faq.htm > List archive: > http://www.mail-archive.com/activedir%40mail.activedir.org/ > > ============================================================== > ========= > Scanned for virus infection by Messagelabs > ============================================================== > ========= > > > List info : http://www.activedir.org/mail_list.htm List FAQ : http://www.activedir.org/list_faq.htm List archive: http://www.mail-archive.com/activedir%40mail.activedir.org/ ======================================================================= Scanned for virus infection by Messagelabs ======================================================================= List info : http://www.activedir.org/mail_list.htm List FAQ : http://www.activedir.org/list_faq.htm List archive: http://www.mail-archive.com/activedir%40mail.activedir.org/
