OfficeJet 6800 a Plus: impossible to activate the Web services; roadblocks at all stages

[Han1231]

I saw a post ealier, but the post is closed so I can't see the solution to the problem. I will copy and paste this message right here, because I did the exact same steps and still have the same problem.

This printer is connected to my network. I want to activate Web services, so I can use ePrint.

When I try to enable Web services from the printer control panel, I said that I might need to enter a proxy address. I'm not running a proxy server, but it is not possible around this prompt.

There are posts on this Board indicating that Web services can be activated with a Wi - Fi connection. I unplugged the Ethernet cable and wireless enabled, but I was always invited address proxy information when I tried to activate the Web services. I disabled wireless and returned to Ethernet.

A response to another post suggested updating the firmware to bypass the proxy server error. HP recommendation is to do it from the control panel of the printer. In the Panel menu control, firmware upgrade is the title of the Web services, which I can't because of the mistake of the proxy. So I downloaded the firmware and tried to install the update from my computer. The update found my printer on the network, but it is gray, saying 'Not applicable', under the State. I couldn't select it.

In another post, someone suggested THAT DNS has been configured. I saw, through Server Web shipped by the printer, there is no configured DNS server (the printer is configured for manual IPv4). So via the integrated Web server, I tried to enter addresses (my domain controller, OpenDNS, Google) DNS server. With each of them, the SAP replied: "an error has occurred. (ipv4Page-400). Click 'OK' to go back. "There is no place to enter the DNS settings on the printer control panel.

I read one if these answer, but can't see the chat history:
What I had to do was enter the DNS settings in SAP to bypass the prompt for proxy information. Step I missed yesterday, when I got page not found error in the SAP, was that I had to do the secure version of the SAP ("https", not "http"), and then the EWS would accept my DNS entries. Once this is done, I went to the printer and could enable Web services without having to provide proxy information.

- Why the printer think there need a proxy address?

- The firmware update will solve the proxy error?

- What is another method for updating the firmware out of the control panel or from my computer?

- How to enter the DNS of the EWS information without getting an error? I fill in the fields, save it and then the fields are empty again.
- What is SAP? 

Thanks in advance!