{"id":10781,"date":"2020-05-07T12:17:49","date_gmt":"2020-05-07T15:17:49","guid":{"rendered":"http:\/\/kb.elipse.com.br\/en\/?p=10781"},"modified":"2020-05-07T12:17:49","modified_gmt":"2020-05-07T15:17:49","slug":"opc-da-client-communication-wont-work-due-to-authentication-failure","status":"publish","type":"post","link":"https:\/\/kb.elipse.com.br\/en\/opc-da-client-communication-wont-work-due-to-authentication-failure\/","title":{"rendered":"OPC DA client communication won&#8217;t work due to authentication failure."},"content":{"rendered":"<h3 style=\"text-align: justify;\"><strong>Question:<\/strong><\/h3>\n<p style=\"text-align: justify;\">What could have caused a communication failure via <a href=\"https:\/\/www.elipse.com.br\/en\/produto\/elipse-e3\/\" target=\"_blank\" rel=\"noopener noreferrer\">Elipse E3<\/a>&#8216;s OPC DA client? I suspect the server isn&#8217;t accepting the client&#8217;s authentication. In this example, I&#8217;m using GE&#8217;s <strong>B&#038;R.DviOPC.2<\/strong> server.<\/p>\n<p>&nbsp;<\/p>\n<h3 style=\"text-align: justify;\"><strong>Solution:<\/strong><\/h3>\n<p style=\"text-align: justify;\">Before performing the configuration procedures described in this article, we suggest that you check if both the firewall and DCOM were properly released, not only with the OPC DA client but also with the server. Therefore, we recommend reading the following articles:<\/p>\n<ul>\n<li style=\"text-align: justify;\"><a href=\"https:\/\/kb.elipse.com.br\/en\/dcom-and-firewall-settings-in-windows-7-for-elipse-applications\/\" target=\"_blank\" rel=\"noopener noreferrer\">DCOM and Firewall Settings in Windows 7 for Elipse applications.<\/a>.<\/li>\n<li style=\"text-align: justify;\"><a href=\"https:\/\/kb.elipse.com.br\/en\/dcom-and-firewall-settings-in-windows-xp2003vista2008-for-elipse-applications\/\" target=\"_blank\" rel=\"noopener noreferrer\">DCOM and Firewall Settings in Windows XP\/2003\/Vista\/2008 for Elipse applications.<\/a>.<\/li>\n<\/ul>\n<p style=\"text-align: justify;\">If even after this configuration the communication with the OPC DA client hasn&#8217;t been established, it&#8217;s possible the connection has an authentication problem. In order to increase the OPC DA client&#8217;s authentication level, follow these procedures:<\/p>\n<ol style=\"text-align: justify;\">\n<li>Firstly, open the\u00a0 DCOM objects configuration window (type <em>dcomcnfg<\/em> at Windows search bar).<\/li>\n<li>Once you&#8217;re at <strong>Computer -> Meu Computer -> DCOM Settings<\/strong>, locate the E3OpcClient object.<\/li>\n<li>Then, access this object&#8217;s properties window, and change the authentication level no\u00a0 <strong>None<\/strong>.<\/li>\n<li>Finally, run the OPC DA client communication again at E3 Studio.<\/li>\n<\/ol>\n<p style=\"text-align: justify;\"><img loading=\"lazy\" class=\"aligncenter wp-image-10401\" src=\"http:\/\/kb.elipse.com.br\/wp-content\/uploads\/2020\/03\/10400\/OPC_Authentication.jpg\" alt=\"comunica\u00e7\u00e3o cliente OPC DA\" width=\"323\" height=\"419\" \/><\/p>\n<h3><\/h3>\n<h3 style=\"text-align: justify;\">Related articles:<\/h3>\n<hr \/>\n<ul style=\"text-align: justify;\">\n<li><a href=\"https:\/\/kb.elipse.com.br\/en\/dcom-and-firewall-settings-in-windows-7-for-elipse-applications\/\" target=\"_blank\" rel=\"noopener noreferrer\">DCOM and Firewall Settings in Windows 7 for Elipse applications.<\/a><\/li>\n<li><a href=\"https:\/\/kb.elipse.com.br\/en\/dcom-and-firewall-settings-in-windows-xp2003vista2008-for-elipse-applications\/\" target=\"_blank\" rel=\"noopener noreferrer\">DCOM and Firewall Settings in Windows XP\/2003\/Vista\/2008 for Elipse applications.<\/a><\/li>\n<li><a href=\"https:\/\/kb.elipse.com.br\/en\/kb30877-opc-communication-only-works-via-studio\/\" target=\"_blank\" rel=\"noopener noreferrer\">KB-30877: OPC communication only works via Studio.<\/a><\/li>\n<li><a href=\"https:\/\/kb.elipse.com.br\/en\/kb39425-opc-communication-not-working-even-after-dcom-has-been-set-up\/\" target=\"_blank\" rel=\"noopener noreferrer\">KB-39425: OPC communication not working, even after DCOM has been set up.<\/a><\/li>\n<\/ul>\n<p style=\"text-align: justify;\">\n","protected":false},"excerpt":{"rendered":"<p>Question: What could have caused a communication failure via Elipse E3&#8216;s OPC DA client? I suspect the server isn&#8217;t accepting the client&#8217;s authentication. In this example, I&#8217;m using GE&#8217;s B&#038;R.DviOPC.2&hellip;<\/p>\n","protected":false},"author":17,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0},"categories":[755,730],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v19.8 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>OPC DA client communication won&#039;t work due to authentication failure.<\/title>\n<meta name=\"description\" content=\"This article illustrates the corrective procedures to be taken when there is a communication failure via OPC DA client in Elipse E3.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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