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RenuAhlawat54483
Beginner

How to fix "Reverse DNS lookup failed" on CUC Subscriber

Hello All,

 

When I ran utils diagnose test on CUC subscriber I got below error against Validate_Network

"Reverse DNS lookup failed"

 

Could you please how to add entries on DNS to fix reverse DNS.

2 ACCEPTED SOLUTIONS

Accepted Solutions
Nithin Eluvathingal
VIP Advisor

Check ptr record on your dns.

 

DNS PTR records are used in reverse DNS lookups. When a user attempts to reach a domain name in their browser, a DNS lookup occurs, matching the domain name to the IP address. A reverse DNS lookup is the opposite of this process: it is a query that starts with the IP address and looks up the domain name.

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lior louk
Contributor

first, "show network eth0" command will give you the information about what DNS servers and domain name as configured for the network adapter.

second, "show myself" command will give you the hostname of this server.

 

now, go to your dns servers and add PTR record for that A record in the specific domain name.

 

usually, the A record is the hostname and the PTR is the ip address.

View solution in original post

4 REPLIES 4
Roger Kallberg
VIP Advisor

Have you checked that you have the needed PTR records in your DNS for the CUC nodes?

Please rate all useful posts
Nithin Eluvathingal
VIP Advisor

Check ptr record on your dns.

 

DNS PTR records are used in reverse DNS lookups. When a user attempts to reach a domain name in their browser, a DNS lookup occurs, matching the domain name to the IP address. A reverse DNS lookup is the opposite of this process: it is a query that starts with the IP address and looks up the domain name.

Please Rate all useful post :)
If this answered your question, please click "ACCEPT AS SOLUTION" Or If you find this response useful, please mark it as "HELPFUL"

View solution in original post

lior louk
Contributor

first, "show network eth0" command will give you the information about what DNS servers and domain name as configured for the network adapter.

second, "show myself" command will give you the hostname of this server.

 

now, go to your dns servers and add PTR record for that A record in the specific domain name.

 

usually, the A record is the hostname and the PTR is the ip address.

View solution in original post

Thank you Lior for your information, it worked for me. 

 

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