Error connecting to server 400

[Szeze]

Can't scan and send the documents to my email due to this problem (error connecting to server 400 )

[Barachiel]

@Szeze

Good Day. A warm welcome to the HP community. 

I reviewed the case regarding issues with the computer crashes randomly. I will be delighted to assist you here.  

Superb description, brilliant troubleshooting and terrific observations made before posting. Kudos to you for that. 😉 

For better clarity and to assist you correctly, I would require more information regarding this:  

Did you try any troubleshooting steps before contacting us? How long are you facing this issue? 

For now please try these steps: 

Step 1: Confirm if the issue is also printing-related

The steps in this document resolve communication and connection errors when scanning only.

If the connection error occurs when both printing and scanning, use the following resources to resolve the issue:

• For wireless connections, go to Guided Solutions: Printer Does Not Maintain Wireless Connection.

• For wired connections, make sure the cable is connected to the printer Ethernet port and to an available port on the router. If the green link is not steady and the orange activity light is not blinking, restart the router, printer, and computer to resolve any network error states.

If you have a connection issue when scanning only, continue to the next step.

Step 2: Restart devices and check driver scan settings

Restarting the computer and printer can restore the lost scan connection.

1. Turn off the printer.

2. Make sure the printer power cord connects directly to an electrical outlet and not through a surge protector or power strip.

3. Close all running programs on your computer, and then shut down the computer.

4. Turn on the printer.

5. Turn on the computer.

6. Search Windows for your printer model name, and then click the printer name in the list of results.

   • If HP Printer Assistant opens, click Scan a Document or Photo or Manage Scan to Computer, and then make sure the check box is selected next to Automatically start Scan to Computer when I log onto Windows.

   • If HP Solution Center opens, click Scan Settings to view scan connection status, settings, and preferences.

   • If your printer name is not in the results, skip to the step to install the HP software for your printer.

7. Try to scan.

If the error persists, continue to the next step.

Step 3: Check the network and printer connection status

Make sure your network is working correctly and the printer is ready for scanning.

1. Make sure the printer is connected to the network.

   • Wireless network connection: On the printer, open the Wireless network or Settings menu to make sure the wireless signal is turned on. Make sure the Wireless icon light is on and steady.

   • Wired network connection: Make sure the cable is connected to the printer Ethernet port and to an available port on the router. The green link light should be steady, and the orange activity light should blink.

     Figure : Connect the cable to the printer and to the router

     

2. Many routers can operate in both 2.4 GHz and 5.0 GHz frequency bands, but not all HP printers support both bands. Make sure the 2.4 GHz router band is enabled and broadcasting. If the router broadcasts separate network names (SSIDs) for each band, connect the printer to the 2.4 GHz band SSID. If the printer supports 5.0 GHz, connect it to the 5.0 GHz band SSID.

3. On the computer, mouse over the network icon in the notification area to view the network name and status of the connection.

     note:

   If you are using a Virtual Private Network (VPN), disconnect from it when trying to scan.

   Figure : Example of a wireless network icon showing the network name and connection status

   

   • If the network shown is not yours (for instance, if you connected to a neighbor's or guest network), you must reconnect to your own network to scan.

   • If the network signal strength is weak, move the computer and printer closer to the router, position the devices away from large metal objects such as bookcases, and move away from devices that emit radio signals such as microwaves and cordless phones.

   • If the network status is not connected, confirm that your network is working correctly, and then check the status again. Make sure a check mark displays next to the network name.

   • If an Airplane icon displays, click the icon, slide the Airplane mode slider to Off, and then connect to your wireless network.

     Figure : Example of Airplane mode enabled

     

4. Try to scan.

If the error persists, continue to the next step.

Step 4: Run the Print and Scan Doctor

HP provides a free tool called HP Print and Scan Doctor to diagnose and resolve printing problems. Download and run HP Print and Scan Doctor  to quickly and automatically perform several troubleshooting tasks known to resolve this issue. When this link is clicked, HP Print and Scan Doctor is downloaded using your Internet browser's download capabilities.

After the Print and Scan Doctor opens, click Fix Scanning to review a list of issues and fixes.

1. In the Print and Scan Doctor results screen, view the list of actionable results.

   • If you see white checkmarks, the printer passed the tests.

   • If you see a white wrench, Print and Scan Doctor found an issue and repaired it.

   • If you see yellow exclamation points, the test failed and required user action, but the step was skipped.

   • If you see a red X, follow the on-screen instructions to resolve the issue.

2. Click Test Scan or Skip.

   • If you click Test Scan, the Print and Scan Doctor launches the HP scanning software to perform a test scan. Follow the on-screen instructions in the scanning software to perform the test.

   • If you click Skip and are not experiencing additional issues, click Quit to exit the tool.

   • If you click Skip and are still experiencing scanning issues, click Support and Troubleshooting for support that is tailored to your scanner, or click HP Support Forum for help from other HP customers.

This should do the trick for you.Please perform all these steps patiently as it is critical to resolving the issue. 

The trick is to remain patient, Going by your technical expertise and competence I am sure you will be able to perform these steps without breaking a sweat. 🙂  

Hope this helps. Let me know how it goes. 😉