To add a proxy in Devolutions Server, you need to add a few command lines to the web.config file.
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Locate and open the web.config file. Its default location is C:\inetpub\wwwroot\dvls\web.config. 
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In the file, locate the <environmentVariables>and</environmentVariables>tags.
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Add the following code between them, replacing the values with your information: <environmentVariable name="http_proxy" value="myproxyaddress"/> <environmentVariable name="https_proxy" value="myproxyaddress"/>For more options, refer to Configure using environment variables. 
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Save and close the file.