Once a proper connection has been reestablished, if this was the issue, then communication between your devices should be restored.The booting process for the router and/or modem may take several minutes. Wait approximately 30 seconds and then reconnect them.First, disconnect the power from your router and/or modem.If your router and/or modem is not able to communicate with devices that are usually connected, you should power cycle the router.
If your computer is connected to a Virtual Private Network (VPN), try disconnecting from the VPN to see if it is interfering with printer communication.If your printer has not been setup wirelessly already, or to reestablish a wireless connection, refer to this Wireless Setup article.
Make sure the printer power is on and that no error condition is indicated on the printer.The steps below will help in resolving the issue and possibly identify the cause. Since there are multiple causes for these messages, there are also multiple possible resolutions. Basically, the printer and computer are not able to communicate. There are many reasons that your printer may be indicated as being "offline" or "not responding". Common Wireless Communication Issues and Steps to Troubleshoot Them