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The Test button in the HDFS connection sends out the following request to determine if the host is valid.
If the response from the HDFS takes long, the connection will be dropped even though the server is reachable and the following error is displayed:
Invalid Host or Port
The error happens when the response from HDFS takes more than 15 seconds to reply. TDCB-3742 has been logged to increase the time out or provide a configurable time out.
As a workaround, if possible, please work with your IT team to improve the time to return a response for [GET] /webhdfs/v1/?op=LISTSTATUS&user.name=user from HDFS.