Troubleshooting
Problem
QRadar® application containers use DNS name resolution to establish connections. If applications suddenly stop resolving hostnames, DNS name servers for all Docker containers can be verified on the Console or App Host in /etc/resolv.conf to confirm the values are correct. Issues can occur when administrators manually update resolv.conf entries without using the qchange_netsetup utility. This article instructs administrators on how to identify the issue and temporarily resolve the problem until a maintenance window can be scheduled to configure DNS values with qchange_netsetup.
Symptom
When DNS is not configured properly, applications are not able to reach out to external URLs. The following application error messages are examples of how manual edits in resolv.conf can lead to application issues:
- QRadar Assistant needs access to api.xforce.ibmcloud.com to check for available upgrades of installed applications. When the API request fails, a "QRadar Assistant is running in offline mode" error is displayed. For example,
- Threat Intelligence also needs to connect to an external API endpoint to collect STIX/TAXII data. In this scenario, the error "There is a problem connecting to the TAXII server" is displayed as Docker cannot resolve the name server IP address.
Document Location
Worldwide
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Document Information
Modified date:
31 October 2022
UID
ibm16827785