To resolve the issue:
Make sure that the name of your host does not contain uppercase letters. Rename the host using lowercase letters if needed.
Check that in every place of DNS configuration (Configuration > DNS and Routing) you have lowercase letters, and that the Search Domain is not empty.
Remove connection to the host in the nworks Enterprise Manager (Connected VMware Servers tab > Remove Connection button).
Make sure that the registry on the Collector server does not contain data for the host. Remove the host folder if needed:
In the nworks Enterprise Manager, add connection to the host using lowercase letters.