I set up the MX922 a couple of weeks ago, it's a nice printer, but it keeps going offline !!!! Why is that ? Yesterday I checked the properties and there was a checkmark beside "Use Printer Offline". How in the world it got like that is beyond me, so I unchecked it, and started printing, everything good. Now today it's offline and I can't get it to come online at all . . . WTF ???? The property "Use Printer Offline" is UNchecked, so that's not the issue . . . It's connected via wireless. This post says you have to keep turning ther printer off and back on to wake it up . . . is that true ???? if so, that's going to make me mad(der than I already am).
So I turned it off, back on, and the printer is now "Ready" ! yea for small miracles, but then I went to print and it won't print !!! it says in the little Canon box "Another printer is using the printer . . . The following status is the usage status of that computer." . . . but there's NO "status of the other computer" . 
So I fiddled with the print queue and it looked like the printer was going to print, then it stopped and did nothing. so I canceled the job from the print queue, tried to print again, first it says "Port is in use", then it went again to ""Another printer is using the printer".
So I shut down Computer B (Windows 7-64 bit), and tried to connect to the printer via wireless . . . it couldn't find the printer when I tried to "Add Printer". So I went through the steps to connect to the wireless router, connected !!!! It still couldn't find the printer 😞
So I plugged in the computer to a USB port, it found it right away, but won't print !!! Now it says "The printer is performing another operation" !!! WTF x 2 !!! What operation might this be ????
So I turned the printer off, back on, and the previous document that wouldn't print due to "The printer is performing another operation" printed ! Woo-hoo, I thought . . . so I tried to print again, and back to square 1: "The Printer is offline" . . . BUT the Control panel settings says that the Printer is Ready !!! ahhhhhhhhh
Now it's printing normally, but it's connected via USB.
Not exactly smooth sailing for a fancy printer . . . . sheesh . . .
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Update: I conncted the printer to PC A, which is my main computer, via USB cord. Now everything is working fine. I set up PC B to the network, and it recognized the printer and I added the printer, but it's shared from PC A.
My conclusion is the wireless doesn't work as expected - too much goofing around and nothing controling the printer. Everything is good now, except for the wireless being a POS.
1 ACCEPTED SOLUTION
VuTroung, you obviously had system admin rights in your corporate IT department in order to systematically configure all the printers in the company by disabling IPv6 at the device level. However, those of us posting here with this particular issue are working at the local or workgroup level at home and experiencing this difficulty with the printer's wireless offline accessibility.
I was agreeing with your solution for the most part; however, the path to disable IPv6 that you cited in your post doesn't exist as such in the home environment running Windows 8.1 or 10 standard. In order to access the Web Services settings at the device level, you need to enter the IP address of the printer's WS properties in a browser. One way to do this follows:
1. Right-click on the Windows icon in the lower left corner of the desktop taskbar.
2. Left-click on Control Panel.
3. Depending on your view - Category (default), Large Icons, Small Icons - left-click on either:
a. Hardware and Sound --> View Devices and Printers (when viewing category); or
b. Devices and Printers (when viewing large or small icons)
4. Locate your printer model series WS device icon or name and right-click on it.
5. Left-click on Properties
6. Left-click on the Web Services tab at the top
7. Under Device Information, you should see a line labeled "Webpage" in the middle of the window with a hyperlinked URL that looks something like "http://192.168.0.197:80/index.html". Left-click on the hyperlink or copy and paste it into your web browser, e.g. Google Chrome, Firefox, Opera, IE, etc.
8. Your browser window should display the printer Network Configuration. Left-click on Advanced button:
9. Next, locate the side-bar on the left-side of the page and left-click on Network Settings:
10. This brings you to the page where you disable IPv6:
