Newly installed Sensor is not Connecting due to Invalid serverIPAddress on input" Error

Products

• Carbon Black EDR (formerly Cb Response)

Issue/Introduction

A sensor is unable to connect to the server, in the sensor.log file the following error is seen

Tid[1E80] 2024-09-09 15:59:26 (e): Could not find IP for URL https://<server_fqdn>:443 - this should never happen
Tid[1E80] 2024-09-09 15:59:26 (e): GetAddrInfoW failed - error 0x2af9

Environment

• Carbon Black EDR Sensor: All Versions
• Windows: All Supported Versions

Cause

The 0x2af9 error is from GetAddrInfoW, Windows API that is unable to get a valid IP from that URL. 

Resolution

1. Can the endpoint reach the address through ping?
   

   ping <fqdn>

2. Does nslookup come back with a valid IP string?

   nslookup <fqdn>

3. Can net-connection to port 443 in powershell return successfully?

   Test-NetConnection -Port 443 <fqdn>

4. Check the output of the Get-NetIPHttpsState command in powershell.

   Get-NetIPHttpsState