My Java Agent in Windows is getting an "unable to identify hostname" error. Why?

What is causing an"unable to identify hostname" error during Java Agent installation?

Java Agent installation is not working for Windows. Telnet connects with the Controller, but gives an "unable to identify hostname" error

Confirm that you set <controller-host> in '<agent_home>/verx.x.x.x.x/conf/controller-info.xml'.
Also set the property such as <application-name>, <tier-name> and <node-name> which is described as "Required:Yes" in the Agent Controller Communication Properties documentation.
If you use a proxy, please set the information in your system property as shown in Java Agent Configuration Properties, Proxy Properties for the Controller documentation.

Share the result of the command "nslookup <YOUR HOST NAME HERE>" in order to confirm that name resolution is working correctly.

---<example>-----

C:\Users\myaccount>nslookup mysaasaccount2020021717171312.saas.appdynamics.com
Server: UnKnown
Address: xxx.xx.xxx.xx

Name: xxxxx.saas.appdynamics.com
Addresses: xx.xx.xx.x
xx.xx.xx.x
Aliases: mysaasaccount.saas.appdynamics.com.localdomain

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If the issue persists, copy a few lines of the log file showing errors and contact AppDynamics Support.