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Our equipment (and also for example HP network printers) use option 81 in the DHCP protocol to specifically request the server to register both the DNS A and PTR records in DNS. I have checked the DHCP audit log but it shows no sign of authenticating or conneting problems. I'm NOT a system administrator, just a programmer ;-) Well, the problems we have began after a complete server hardware and software upgrade so it is certainly possible a mistake has been made...

I will forward your tips to our system administrators and hope they NOW are able to solve our problem... Kind regards, Tobias Olofsson ONLY if you don't use "Update Credentials" (a regulary user account with non-expiring password).

It seems the wireless DNS entry is the predominant one which is held in DNS which makes name resolution fail often. When I came in today I hard wired (and have been all morning).

I performed a cold boot of my machine and obtained a wired DHCP address.

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The DHCP server is installed on a domain controller/DNS server."Saibot75" If "Secure only Updates" are being used (they should be) the DHCP server might not be authenticating, or it might not be using the correct DNS server set (ONLY), or it might not be a member of the DNSUpdate Proxy groups, or better be using the correct DNS Update credentials with a valid and current password.If the Update Credentials works PREVIOUSLY then consider that this account may need an non-expiring password. DHCP server is NOT a member of the DNSUpdate Proxy group, should it be ?OK Every half hour the lease will try to renew by machines itself Because generally client will try renewal after half lease time elapsed Now Even if you keep No refresh (1 HR) refresh (2 HRS) = 3 HRS, scavenging will run every 3 HRS and it will delete records older than 3 HRS Most of the records are updated every half an hour, hence scavenging will not delete most of the records Is there any specific reason for keeping such a short duration, if you could please explain... Please set your DHCP advanced DNS options as below so that your DNS records will get updated Also add DHCP server to DNSUpdate Proxy Group on Domain Controller (DNS Server) You already have set credentials in DHCP console Mahesh I inherited the setup and am in the process of trying to clean up some of the previous admins configurations. The DHCP lease times have been reduced to 1 hour for each VLAN.The reason I suggesting you to not keep such a small scavenging period is all SRV records may get deleted if they do not updated within 3 HRS What is the frequency of DHCP client in out ? The devices are moving constantly as team members go from desk to conference and desk again. The changes seem to be making a difference in the DNS clean up.

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