Data Sources is showing error message "Hostname/IP is unreachable" for vCenter Server and NSX Manager in Aria operations for Networks

Products

• VCF Operations for Networks

Issue/Introduction

• In VCF Operations for Networks, the Collector node fails to resolve the FQDN or IP of vCenter Server and NSX Manager when using a standard nslookup command. However, resolution is successful when the DNS server is explicitly specified in the command (e.g., nslookup <FQDN> <DNS-Server-IP>).
• Symptoms include:
  • Error messages visible in the VCF Operations for Networks (AON) GUI regarding component reachability.

• • Collector logs located at /var/log/arkin/collector/latest_error.log contain DNS resolution or connection timeout errors.

• • The file /etc/network/interfaces contains the correct DNS server entries, yet the OS resolver does not utilize them.
  • The vCenter and NSX Manager could NOT be resolved from Collector by "nslookup FQDN/IP" ,while they could be resolved by "nslookup FQDN/IP DNS-Server-IP"

Environment

VCF Operations for Networks

Cause

The networking stack or local resolver service on the Collector node failed to correctly initialize or bind the DNS configuration defined in the network interfaces file.

Resolution

 

• Log in to the Collector node via SSH or console as a user with sudo privileges.

• Restart the networking service to force the OS to re-read the configuration and re-initialize the resolver: sudo /etc/init.d/networking restart

• Wait approximately 2-5 minutes for services to stabilize.

• Verify the fix by running a standard nslookup against the vCenter or NSX Manager FQDN without appending the DNS server IP: nslookup <FQDN>