Reverse DNS lookup failed installation CUCM

[alfonso.cornejo]

Hi to all,

I'm installing a new CUCM with DNS information configured but I'm getting an error message about Reverse DNS lookup.

I have a register in the dns for the name of the cucm and reverse dns lookup for the network that this server has configured.

Does anyone knows what exactly has to be configured in the DNS server in order to support the dns configuration for the cucm???

Here I attached the error message.

Please your help.

Thanks in advance.

[alfonso.cornejo]

The DNS server is a Win2k8

[Aman Soi · Accepted solution]

Hi Alfonso,

Please check whether DNS server is reachable from Call Manager by using utils network ping command .

Secondly, seeing the error message it looks that Reverse DNS lookup needs to be configured on Windows 2008 Server on which u have installled DNS functionality.

Please refer this for reverse DNSlookup configurration.

http://technet.microsoft.com/en-us/library/cc725670(v=ws.10).aspx

Also, are u using any underscors in Publisher and Secondary Hostname which seems to be limitation on Microsift DNS servers.

http://www.cisco.com/en/US/products/sw/voicesw/ps556/products_tech_note09186a0080b26146.shtml

regds,

aman

[alfonso.cornejo]

Hi Aman,

Thanks alot for your reply, I have configured all that but is still not working...do you know if I have to check the option "Create Associated Pointer (PTR) Record" when I create the dns record in the dns server??

Thanks in advance

Sent from Cisco Technical Support iPhone App

[Jaime Valencia · Accepted solution]

Yes, you also need the PTR.

Create it manually and reload the zone.

HTH

java

if this helps, please rate

www.cisco.com/go/pdihelpdesk

[Aman Soi]

Hi Alfonso,

Thanks to Mr. Jaime.

Please refer the URL  for adding PTR.

http://technet.microsoft.com/en-us/library/cc844045(v=ws.10).aspx

Please share findings on Call Manager installation the point where it is getting stuck.

regds,

aman

[iverson.justin]

Keep getting Reverse DNS lookup mismatch, however I re-created the zone several times and only one PRT on server, how is reverse dns not working?