Contents

Introduction

Problem

Sample DNS Client related Syslog messages from StarOS

Solution

Related Information

Introduction

This document describes the details of the Domain Name System (DNS) failure codes that are printed in the Syslogs when the DNS-Client feature is enabled on StarOS.

Problem

StarOS DNS Client prints Syslog messages with fail-reason codes when it encounters issues with the DNS queries. These Syslog messages mostly contain response error-codes. Understanding these error-codes can help you troubleshoot the DNS issues.

Sample DNS Client related Syslog messages from StarOS

Here are a few sample Syslog messages that show various fail-reason codes.

[diameter-dns 92604 error] [3/1/44451 <diamproxy:20> er_dns_client.c:2938] [software internal security system syslog] Diameter DNS : response received with failreason : 4. Query : servername.dcca.example.com

[diameter-dns 92604 error] [3/1/44451 <diamproxy:49> er_dns_client.c:2938] [software internal security system syslog] Diameter DNS : response received with failreason : 11. Query : servername.dcca.example.com

[diameter-dns 92604 error] [3/1/44451 <diamproxy:31> er_dns_client.c:2938] [software internal security system syslog] Diameter DNS : response received with failreason : 12. Query : servername.dcca.example.com

Solution

This table provides an explanation of the fail-reason code that can be used to narrow down the problem and troubleshoot the issue further. Usually, the Syslog message states whether the failure is related to a message received or an internal issue with the DNS Client.

Fail-Reason Code

Details

1

No relevant answer for the record type

2

Unable to interpret the request. Format Error

3

Server internal failure

4

DNS record does not exist

5

Opcode not supported

6

Server refused to perform the operation

11

Connection Refused

12

DNS query timed out

128

DNS query depth exceeded

Note: The StarOS Fail-Reason codes are different from the DNS Response RCODE values listed in RFC-6895

Related Information

- Cisco PGW Configuration Guide