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CUCM 11.5.1 WARNING :DNS unreachable

iptsupport
Level 4
Level 4

Hello , 

we found this warning message that DNS is unreachable on the publisher CUCM GUI.

My version of CUCM 11.5.1.10000-6.
When I tried to resolve some hostnames from both CUCM nodes through CLI it was normally worked so DNS is not unreachable.

we run diagnostic test and we see error "reverse DNS Lookup mismatch"

Any ideas?

4 Replies 4

Rajan
VIP Alumni
VIP Alumni
Hi,

Please check the below link with similar issue:

http://benmorgan.com.au/blog/dns-unreachable-warning-cucm-version-11-x/

HTH
Rajan
Pls rate all useful posts

Dennis Mink
VIP Alumni
VIP Alumni

This is because of failed reverse lookup; a false positive if you ask me

Please remember to rate useful posts, by clicking on the stars below.

I checked reverse lookup with ping -a and it is good .
any idea ?

Please verify the reverse DNS entry on your DNS server.

 

Please rate if helpful.

 

HTH,

Akansha Sharma

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