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Unable to make a test connection using HDP On-Premises connector

Information

 
TitleUnable to make a test connection using HDP On-Premises connector
URL Nameunable-to-make-a-test-connection-using-hdp-on-premises-connector
Article Number000134799
EnvironmentProduct: Hybrid Data Pipeline On-Premises Connector
Version: 4.5.0.21
OS: Windows
Question/Problem Description
When attempting to test a data source (DSN) in the HDP UI that uses an On-Premises Connector, the errors below are returned. 
The On-Premises Connector is newly installed.
The 3 documented On-Premises Connector ports are open. 
All 4 indicators on the Configuration Tool Status tab are green.
HDP server product version is 4.3.0.32.
Steps to Reproduce
Clarifying Information
Error MessageHDP WebUI:
Unable to process your request. Ensure that your computer is connected to the internet and then try again, or the current session might be invalid, please refresh the page and then try again.

opaccessor log:
13-Feb-2019 15:40:43.676 INFO [NotificationService2] com.ddtek.opaccessor.e.g Processing extended notification payload, OPAS<LF>IP<LF>127.0.0.1<LF>service.myserver.com
13-Feb-2019 15:40:43.676 FINE [ConnectionQueue] com.ddtek.opaccessor.a.run Attempting to make a connection to the DAS on-premise port using url service.myserver.com, routing key null, connection pool object count 2, OpasConnection objectId 0
13-Feb-2019 15:40:44.698 FINE [ConnectionQueue20] com.ddtek.opaccessor.g.b DAS Server returned HTTP HTTP/1.1 400 Bad Request<CR/LF>x-datadirect-opas-waiting-count:0<CR/LF><CR/LF>
13-Feb-2019 15:40:44.698 INFO [ConnectionQueue20] com.ddtek.opaccessor.g.b IOException reading HTTP header from remote connection [remote-socket=service.myserver.com/11.22.111.105:40501][exception=HTTP Response from server OPA port was null, connection cannot be made.]
Defect Number
Enhancement Number
Cause
The exact cause is not known at this time.
Resolution
Restarting the On-Premises Connector service resolved the issue.
Workaround
Notes
References to other documentation:
Progress article:
 List of ports required for Hybrid Data Pipeline (HDP)
Last Modified Date11/20/2020 7:04 AM
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