Unable to connect to proxy server virus

Troubleshooting for "Virus signature database update failed" message
Fix Unable to connect to the proxy server Chrome Error Caused by

To view instructions for an operating system other than Windows, choose the appropriate operating system below:

Check to see if you can update after each step

Click Update Update virus signature database. If the update fails, proceed to the next step until you are able to update.

    Remove any previously installed antivirus software: Common antivirus software removal tools
    Exclude ESET from detection on your third-party firewall (such as Norton Personal Firewall, ZoneAlarm, or others). If you are using the ESET Personal firewall and have no other firewall software installed, disregard this step.
    Configure your update settings properly:
      Open the main program window and press F5 to access the Advanced setup window.
      Click Update, expand HTTP Proxy, select Do not use proxy server from the Proxy mode drop-down menu, and then click OK. (Version 8.x and earlier: expand Update and then click Update → Setup, click the HTTP Proxy tab, make sure that Do not use proxy server is selected, and then click OK).
      If your settings in HTTP Proxy are locked (read only) then this proxy policy was forced by ERA Server. You can revoke this setting from the ERA Web Console. If there is no access to ERA Server (for example, ERA Server no longer exists) uninstall the ERA Agent and then Uninstall and reinstall your ESET product.
    Test communications with the ESET update server:
      Press the Windows key + on your keyboard, type cmd into the text field and press ENTER.

      Windows 8 users: Press the Windows key + Q to open an app search and type cmd into the Search field.

      Type ping update.eset.com into the command prompt and press ENTER (see Figure 1-1).
      If you are able to connect to the update server, you will see a Reply from... message followed by the IP address of the server you are trying to reach.

      Figure 1-1

Source: support.eset.com

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