https://community.appian.com/discussions/f/data/26281/cannot-open-connectionHi, Recently we deployed a new application to the Production environment. But facing DB connectivity issues. Please find the screenshot for reference: After creating the Data Source at Admin Console it shows Test Successful. Please find the screenshoten-USTelligent Community 12https://community.appian.com/thread/103119?ContentTypeID=1Tue, 18 Oct 2022 15:47:34 GMTd3a83456-d57b-489c-a84c-4e8267bb592a:7cf3cbe6-5ec9-47d3-aa67-d49dce22a2a2Chris<p>We recently had a connected database move to a separate cloud server and we&#39;re also troubleshooting this issue, we see it sporadically (1 out of ~200 calls) and are investigating at the network level.</p> <p>The &quot;<em><strong>cannot open connection</strong></em>&quot; error is thrown by any query expressions or Write to DSE services, while the Query DB node throws a slightly different&nbsp;error when the issue arises:&nbsp; &quot;<em><strong>Unable to obtain a connection within configured timeout</strong></em>&quot;.</p> <p>Agree with Stefan, review your log files and open a support case if you are on Appian Cloud.</p> <p>EDIT:&nbsp; We are on-prem at this time.</p><div style="clear:both;"></div>https://community.appian.com/thread/103117?ContentTypeID=1Tue, 18 Oct 2022 14:54:47 GMTd3a83456-d57b-489c-a84c-4e8267bb592a:b5e47b07-b6b4-4ec3-8d68-d84bfdc82e4aStefan Helzle<p>Is this on-premise or Appian cloud? In case of Appian cloud, I would open a support case. But before doing this, check the tomcat-stdout logfile for any details.</p><div style="clear:both;"></div>