# Websockify novnc - failed to connect to server - 400 error **URL:** \ **Category:** Get Help\ **Created:** [May 15, 2024, 9:11pm UTC](https://discourse.openondemand.org/t/websockify-novnc-failed-to-connect-to-server-400-error/3489 "2024-05-15T21:11:48Z")\ **Posts on this page:** 5\ **Page:** 1

**Author:** ![vallerul](https://sea1.discourse-cdn.com/flex015/user_avatar/discourse.openondemand.org/vallerul/32/963_2.png) [@vallerul](https://discourse.openondemand.org/u/vallerul)\ **Post date:** [May 15, 2024, 9:11pm UTC](https://discourse.openondemand.org/t/websockify-novnc-failed-to-connect-to-server-400-error/3489/1 "2024-05-15T21:11:48Z")

Hello, We are using ondemand-3.1 in RHEL 8.6 We are trying to setup a desktop app, and when i click connect - novnc complains with “failed to connect to server” All the logs seem to be fine, except websockify : WebSocket server settings: - Listen on :63002 - Flash security policy server - No SSL/TLS support (no cert file) - proxying from :63002 to localhost:5901 WARNING: no ‘numpy’ module, HyBi protocol will be slower [isvood002.mskcc.org](http://isvood002.mskcc.org) - - [15/May/2024 14:44:54] code 400, message Client must support ‘binary’ or ‘base64’ protocol [isvood002.mskcc.org](http://isvood002.mskcc.org) - - [15/May/2024 14:44:54] code 405, message Method Not Allowed May i know if anyone else saw similar issue? i am using the following rpms from OOD repo. [https://yum.osc.edu/ondemand/latest/compute/el8/x86\_64/turbovnc-3.1.1-1.el8.x86\_64.rpm](https://yum.osc.edu/ondemand/latest/compute/el8/x86_64/turbovnc-3.1.1-1.el8.x86_64.rpm) [https://yum.osc.edu/ondemand/latest/compute/el8/x86\_64/python3-websockify-0.11.0-1.el8.noarch.rpm](https://yum.osc.edu/ondemand/latest/compute/el8/x86_64/python3-websockify-0.11.0-1.el8.noarch.rpm) or [https://yum.osc.edu/ondemand/latest/compute/el8/x86\_64/python3-websockify-0.10.0-1.el8.noarch.rpm](https://yum.osc.edu/ondemand/latest/compute/el8/x86_64/python3-websockify-0.10.0-1.el8.noarch.rpm) Other log outputs: Setting VNC password… Starting VNC server… Warning: [isvstc02.mskcc.org:1](http://isvstc02.mskcc.org:1) is taken because of /tmp/.X1-lock Remove this file if there is no X server [isvstc02.mskcc.org:1](http://isvstc02.mskcc.org:1) Killing Xvnc process ID 3483844 Xvnc process ID 3483844 already killed Xvnc did not appear to shut down cleanly. Removing /tmp/.X11-unix/X1 Xvnc did not appear to shut down cleanly. Removing /tmp/.X1-lock Desktop ‘TurboVNC: [isvstc02.mskcc.org:1](http://isvstc02.mskcc.org:1) (vallerul)’ started on display [isvstc02.mskcc.org:1](http://isvstc02.mskcc.org:1) Log file is vnc.log Successfully started VNC server on isvstc02:5901… Script starting… Starting websocket server… Launching desktop ‘gnome’… cat: /etc/xdg/autostart/gdu-notification-daemon.desktop: No such file or directory [websockify]: pid: 3501733 (proxying 63002 ==\> localhost:5901) [websockify]: log file: ./websockify.log [websockify]: waiting … [websockify]: started successfully (proxying 63002 ==\> localhost:5901) Scanning VNC log file for user authentications… Generating connection YAML file… TurboVNC Server (Xvnc) 64-bit v2.2.3 (build 1.el7) Copyright (C) 1999-2019 The VirtualGL Project and many others (see README.txt) Visit [http://www.TurboVNC.org](http://www.TurboVNC.org) for more information on TurboVNC 15/05/2024 14:44:43 Using security configuration file /opt/TurboVNC/etc/turbovncserver-security.conf 15/05/2024 14:44:43 Enabled security type ‘tlsvnc’ 15/05/2024 14:44:43 Enabled security type ‘tlsotp’ 15/05/2024 14:44:43 Enabled security type ‘tlsplain’ 15/05/2024 14:44:43 Enabled security type ‘x509vnc’ 15/05/2024 14:44:43 Enabled security type ‘x509otp’ 15/05/2024 14:44:43 Enabled security type ‘x509plain’ 15/05/2024 14:44:43 Enabled security type ‘vnc’ 15/05/2024 14:44:43 Enabled security type ‘otp’ 15/05/2024 14:44:43 Enabled security type ‘unixlogin’ 15/05/2024 14:44:43 Enabled security type ‘plain’ \_XSERVTransmkdir: Owner of /tmp/.X11-unix should be set to root 15/05/2024 14:44:43 Desktop name ‘TurboVNC: [isvstc02.mskcc.org:1](http://isvstc02.mskcc.org:1) (vallerul)’ ([isvstc02.mskcc.org:1](http://isvstc02.mskcc.org:1)) 15/05/2024 14:44:43 Protocol versions supported: 3.3, 3.7, 3.8, 3.7t, 3.8t 15/05/2024 14:44:43 Listening for VNC connections on TCP port 5901 15/05/2024 14:44:43 Interface 0.0.0.0 15/05/2024 14:44:43 Framebuffer: BGRX 8/8/8/8 15/05/2024 14:44:43 New desktop size: 800 x 600 15/05/2024 14:44:43 New screen layout: 15/05/2024 14:44:43 0x00000040 (output 0x00000040): 800x600+0+0 15/05/2024 14:44:43 Maximum clipboard transfer size: 1048576 bytes 15/05/2024 14:44:43 VNC extension running! 15/05/2024 14:44:45 New desktop size: 800 x 600 Thank you. ---

**Author:** ![vallerul](https://sea1.discourse-cdn.com/flex015/user_avatar/discourse.openondemand.org/vallerul/32/963_2.png) [@vallerul](https://discourse.openondemand.org/u/vallerul)\ **Post date:** [May 15, 2024, 9:46pm UTC](https://discourse.openondemand.org/t/websockify-novnc-failed-to-connect-to-server-400-error/3489/2 "2024-05-15T21:46:20Z")

I realized that the turbovnc and websockify that i am using are from within a container, and not the operating system. It could be that this container that i made for CentOS7 is not compatible with RHEL 8. May i know if anyone has accomplished making a singularity container for desktop app, with RHEL 8/EL8? ---

**Author:** ![jeff.ohrstrom](https://sea1.discourse-cdn.com/flex015/user_avatar/discourse.openondemand.org/jeff.ohrstrom/32/136_2.png) [@jeff.ohrstrom](https://discourse.openondemand.org/u/jeff.ohrstrom)\ **Post date:** [June 12, 2024, 1:47pm UTC](https://discourse.openondemand.org/t/websockify-novnc-failed-to-connect-to-server-400-error/3489/3 "2024-06-12T13:47:31Z")

Yes, in 3.0 (and 3.1 with some extra options) we added the `vnc_container` template type to support things like this. [https://osc.github.io/ood-documentation/latest/reference/files/submit-yml/vnc-container-bc-options.html](https://osc.github.io/ood-documentation/latest/reference/files/submit-yml/vnc-container-bc-options.html) ---

There’s also a starter .def file on that page. ---

**Author:** ![system](https://us1.discourse-cdn.com/flex015/uploads/osc/original/2X/b/bae70bd0ed39a3ae769c2108155f4cb3e9da8385.png) [@system](https://discourse.openondemand.org/u/system)\ **Post date:** [December 9, 2024, 1:48pm UTC](https://discourse.openondemand.org/t/websockify-novnc-failed-to-connect-to-server-400-error/3489/5 "2024-12-09T13:48:37Z")

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