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    AJAX timeout error during a print

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    Tuning and tweaking
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    • appjawsundefined
      appjaws
      last edited by

      Hi
      I am using wifi firmware 1.15c and web interface 1.12 and keep getting timeouts when the machine is idle and when printing.
      It appears random.
      I just reconnect again and the print progress is up to date, so it's not a big problem, just frustrating, after all it shouldn't happen.
      This is the error :-
      Communication Error

      An AJAX error has been reported, so the current session has been terminated.

      Please check if your printer is still on and try to connect again.

      Error reason: timeout

      What can I do to provide more information?

      appjaws - Core XYUV Duet Ethernet Duex5
      firmware 3.5.0-rc.4 Web Interface 3.5.0-rc.4
      Ormerod 1-converted to laser engraver, Duet wifi
      OpenSCAD version 2024.03.18
      Simplify3D 5.1.2

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      • DjDemonDundefined
        DjDemonD
        last edited by

        I've had lots of these too. I'm running windows 10 and using chrome. It doesn't cause any trouble I just hit reconnect but it is happening every 10-15 minutes.

        Simon. Precision Piezo Z-Probe Technology
        www.precisionpiezo.co.uk
        PT1000 cartridge sensors NOW IN, just attach to your Duet board directly!

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        • dc42undefined
          dc42 administrators
          last edited by

          Can both of you confirm that the error reason given is always timeout, and that you are running DWC 1.12?

          Duet WiFi hardware designer and firmware engineer
          Please do not ask me for Duet support via PM or email, use the forum
          http://www.escher3d.com, https://miscsolutions.wordpress.com

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          • DjDemonDundefined
            DjDemonD
            last edited by

            Firmware Version: 1.15c (2016-09-05)
            WiFi Server Version: 1.02
            Web Interface Version: 1.12

            Communication Error

            An AJAX error has been reported, so the current session has been terminated.

            Please check if your printer is still on and try to connect again.

            Error reason: timeout

            Simon. Precision Piezo Z-Probe Technology
            www.precisionpiezo.co.uk
            PT1000 cartridge sensors NOW IN, just attach to your Duet board directly!

            1 Reply Last reply Reply Quote 0
            • appjawsundefined
              appjaws
              last edited by

              Yes the reason is always timeout and I am using DWC1.12

              appjaws - Core XYUV Duet Ethernet Duex5
              firmware 3.5.0-rc.4 Web Interface 3.5.0-rc.4
              Ormerod 1-converted to laser engraver, Duet wifi
              OpenSCAD version 2024.03.18
              Simplify3D 5.1.2

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              • DjDemonDundefined
                DjDemonD
                last edited by

                I have only used Chrome for windows 10 so far. I will try other browsers as I read in another thread it might be the browser ending the session.

                Simon. Precision Piezo Z-Probe Technology
                www.precisionpiezo.co.uk
                PT1000 cartridge sensors NOW IN, just attach to your Duet board directly!

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                • dc42undefined
                  dc42 administrators
                  last edited by

                  I suspect it's caused by an unreliable WiFi connection, for example due to temporary interference. I've asked chrishamm if he can change DWC to do a configurable number of retries instead of just one.

                  Duet WiFi hardware designer and firmware engineer
                  Please do not ask me for Duet support via PM or email, use the forum
                  http://www.escher3d.com, https://miscsolutions.wordpress.com

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                  • W3DRKundefined
                    W3DRK
                    last edited by

                    For what it's worth I have yet to experience this with my Duet WiFi. I use both Chrome and Firefox on Linux…no issues at all.

                    On the other hand, with my Duet 0.6-which is obviously wired- I receive the AJAX timeout error like clockwork. It's not running the latest firmware though and I can't recall off hand what version it is...maybe 1.12 I believe...

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                    • appjawsundefined
                      appjaws
                      last edited by

                      @dc42:

                      I suspect it's caused by an unreliable WiFi connection, for example due to temporary interference. I've asked chrishamm if he can change DWC to do a configurable number of retries instead of just one.

                      I have a pre-production duet wifi board.
                      Nothing else is on my network wirelessly so any hints as to what could be causing interference?

                      appjaws - Core XYUV Duet Ethernet Duex5
                      firmware 3.5.0-rc.4 Web Interface 3.5.0-rc.4
                      Ormerod 1-converted to laser engraver, Duet wifi
                      OpenSCAD version 2024.03.18
                      Simplify3D 5.1.2

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                      • appjawsundefined
                        appjaws
                        last edited by

                        @dc42:

                        I suspect it's caused by an unreliable WiFi connection, for example due to temporary interference. I've asked chrishamm if he can change DWC to do a configurable number of retries instead of just one.

                        I have a pre-production duet wifi board.
                        Nothing else is on my network wirelessly so any hints as to what could be causing interference?

                        appjaws - Core XYUV Duet Ethernet Duex5
                        firmware 3.5.0-rc.4 Web Interface 3.5.0-rc.4
                        Ormerod 1-converted to laser engraver, Duet wifi
                        OpenSCAD version 2024.03.18
                        Simplify3D 5.1.2

                        1 Reply Last reply Reply Quote 0
                        • W3DRKundefined
                          W3DRK
                          last edited by

                          I think the ESP8266 is limited to 2.4GHz which can get really crowded these days. It may be nothing particular to your network but rather any number of wireless devices in your vicinity that share the same RF spectrum.

                          Most wireless routers or access points give you ability to manually choose a particular "channel" to use, you may want to try arbitrarily changing that to a few different ones and see if that makes a difference.

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                          • appjawsundefined
                            appjaws
                            last edited by

                            @W3DRK I'll look into that, thanks for the info

                            appjaws - Core XYUV Duet Ethernet Duex5
                            firmware 3.5.0-rc.4 Web Interface 3.5.0-rc.4
                            Ormerod 1-converted to laser engraver, Duet wifi
                            OpenSCAD version 2024.03.18
                            Simplify3D 5.1.2

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                            • T3P3Tonyundefined
                              T3P3Tony administrators
                              last edited by

                              I am on my phone right now so can't check but I thought the latest version of DWC has the ability to set the number of AJAX timeout retries…

                              www.duet3d.com

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                              • appjawsundefined
                                appjaws
                                last edited by

                                Yes you are right, I've just set it to 3 so I will see how that performs.

                                appjaws - Core XYUV Duet Ethernet Duex5
                                firmware 3.5.0-rc.4 Web Interface 3.5.0-rc.4
                                Ormerod 1-converted to laser engraver, Duet wifi
                                OpenSCAD version 2024.03.18
                                Simplify3D 5.1.2

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                                • botundefined
                                  bot
                                  last edited by

                                  In regards to the WIFI channel selection, there are free programs available that detect and list all SSIDs in range, their strength, and the channel they are broadcasting on. This is really useful information for selecting a channel to use for your own SSID.

                                  Microwave ovens can disturb wifi signals at 2.4Ghz. As can wireless landline telephones.

                                  *not actually a robot

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                                  • DjDemonDundefined
                                    DjDemonD
                                    last edited by

                                    I'll try independently testing the increase retries for dwc (how do I set this?) and installing a WiFi access point in the room near to the printer.

                                    Simon. Precision Piezo Z-Probe Technology
                                    www.precisionpiezo.co.uk
                                    PT1000 cartridge sensors NOW IN, just attach to your Duet board directly!

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                                    • DjDemonDundefined
                                      DjDemonD
                                      last edited by

                                      Definitely fewer disconnects with a router in the room with the printer in it, on a clear channel and fairly close by.

                                      Simon. Precision Piezo Z-Probe Technology
                                      www.precisionpiezo.co.uk
                                      PT1000 cartridge sensors NOW IN, just attach to your Duet board directly!

                                      1 Reply Last reply Reply Quote 0
                                      • DjDemonDundefined
                                        DjDemonD
                                        last edited by

                                        Switched to Chrome Canary and had even fewer but still maybe 2 today in about 3-4 hours. This is not really a problem. Still unsure why these are happening though.

                                        Simon. Precision Piezo Z-Probe Technology
                                        www.precisionpiezo.co.uk
                                        PT1000 cartridge sensors NOW IN, just attach to your Duet board directly!

                                        1 Reply Last reply Reply Quote 0
                                        • Russ Griesundefined
                                          Russ Gries
                                          last edited by

                                          also for me i get a lot of timeouts.

                                          it dose seem to be when its trying to do something, like download a file or during printing.

                                          some times when i go to the G code tab it starts lagging and will not display stuff, or just time out.

                                          I think part of this is the connection for me ( but I'm not sure of that yet) , but i though i would post for more feed back!

                                          ~Russ

                                          One Day At A Time…
                                          My Main Research Page:
                                          http://rwgresearch.com/open-projects/3d-printing-research/

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                                          • dc42undefined
                                            dc42 administrators
                                            last edited by

                                            FWIW the WiFi received signal strength is reported to the USB port when you enable WiFi. This might help diagnose connection issues. I'll make it easier to retrieve this information in a future firmware release.

                                            Duet WiFi hardware designer and firmware engineer
                                            Please do not ask me for Duet support via PM or email, use the forum
                                            http://www.escher3d.com, https://miscsolutions.wordpress.com

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