Error: "Cannot validate proxy configuration. Proxy server was not reachable with specified host and port." / "Temporary failure in name resolution" when connecting to the online depot

Products

• VMware Cloud Foundation
• VMware SDDC Manager

Issue/Introduction

When a proxy is configured in the VCF 9.0 Installer, "Connect to the online depot" fails with the error:

Cannot validate proxy configuration. Proxy server was not reachable with specified host and port.

The Operations Manager log shows the following error:

Log Location: var/log/vmware/vcf/operationsmanager/operationsmanager.log

Error testing proxy at <Proxy_Hostname>:8080 connecting to https://dl.broadcom.com.
java.net.UnknownHostException: <Proxy_Hostname>: Temporary failure in name resolution

Environment

VCF Installer 9.0

Cause

This issue occurs if the VCF Installer appliance cannot resolve DNS for the proxy server.

Resolution

DNS must be configured so that the VCF Installer can resolve the proxy. The steps below can help validate DNS and adjust DNS servers:

1. Login to VCF Installer:
   • SSH into the VCF Installer using the vcf account.
     
     
2. Validate the correct DNS server.
   • Review the currently configured DNS servers with the nmctl command:
     
     nmctl show-dns


   • To add/remove DNS servers from the VCF Installer, leverage Configure/Update DNS Server IP Address in SDDC Manager or the VCF Installer through Command Line.
     
     
3. Validate DNS is working with the nslookup command. 
   • Run the following command on the VCF Installer command line:
     
     nslookup <proxy_hostname> 
     
     Note: Replace <proxy_hostname> with the proxy configured.

Additional Information

If the operations manager log contains "No route to host" refer to Error: "Cannot validate proxy configuration. Proxy server was not reachable with specified host and port." / "No route to host"