-| <br /><ul><li>The Microsoft Azure Recovery Service Agent was unable to connect to Microsoft Azure Backup. (ID: 100050) Check your network settings and ensure that you are able to connect to the internet.<li>(407) Proxy Authentication Required. |A proxy is blocking the connection. | <ul><li>In Internet Explorer, go to **Tools** > **Internet options** > **Security** > **Internet**. Select **Custom Level** and scroll down to the **File download** section. Select **Enable**.<p>You might also have to add [URLs and IP addresses](install-mars-agent.md#verify-internet-access) to your trusted sites in Internet Explorer.<li>Change the settings to use a proxy server. Then provide the proxy server details.<li> If your machine has limited internet access, ensure that firewall settings on the machine or proxy allow these [URLs and IP addresses](install-mars-agent.md#verify-internet-access). <li>If you have antivirus software installed on the server, exclude these files from the antivirus scan: <ul><li>CBEngine.exe (instead of dpmra.exe).<li>CSC.exe (related to .NET Framework). There's a CSC.exe for every .NET Framework version installed on the server. Exclude CSC.exe files for all versions of .NET Framework on the affected server. <li>The scratch folder or cache location. <br>The default location for the scratch folder or the cache path is C:\Program Files\Microsoft Azure Recovery Services Agent\Scratch.<li>The bin folder at C:\Program Files\Microsoft Azure Recovery Services Agent\Bin.
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