What to look at for resolving Nice DCV 404 errors


I've got an EC2 instance setup with Nice DCV. I have setup port access in my security rules and created a session in nice dcv. However, whenever I try to connect to the session via the browsed, I get an HTTP ERROR 404. I can't seem to find any information in the Nice DCV docs about causes of 404 except for the session resolver which I'm not using. How can I go about resolving this issue?

Below is the output from dcv list-sessions -j

    "id" : "cloud9-session",
    "owner" : "ubuntu",
    "num-of-connections" : 0,
    "creation-time" : "2022-09-23T12:58:40.919860Z",
    "last-disconnection-time" : "",
    "licenses" : [
        "product" : "dcv",
        "status" : "licensed",
        "check-timestamp" : "2022-09-23T12:58:42.540422Z",
        "expiration-date" : ""
        "product" : "dcv-gl",
        "status" : "licensed",
        "check-timestamp" : "2022-09-23T12:58:42.540422Z",
        "expiration-date" : ""
    "licensing-mode" : "EC2",
    "storage-root" : "",
    "type" : "virtual",
    "status" : "running",
    "x11-display" : ":0",
    "x11-authority" : "/run/user/1000/dcv/cloud9-session.xauth",
    "display-layout" : [
        "width" : 800,
        "height" : 600,
        "x" : 0,
        "y" : 0

This is the output from dcv get-config

web-use-https = false
web-port = 8080
web-extra-http-headers = [('test-header', 'test-value')]

authentication = 'none'

This is the output from systemctl status dcvserver

● dcvserver.service - NICE DCV server daemon
     Loaded: loaded (/lib/systemd/system/dcvserver.service; enabled; vendor preset: enable>
     Active: active (running) since Fri 2022-09-23 12:58:40 UTC; 18min ago
   Main PID: 715 (dcvserver)
      Tasks: 6 (limit: 76196)
     Memory: 39.9M
     CGroup: /system.slice/dcvserver.service
             ├─715 /bin/bash /usr/bin/dcvserver -d --service
             └─724 /usr/lib/x86_64-linux-gnu/dcv/dcvserver --service

Sep 23 12:58:40 ip-10-0-0-115 systemd[1]: Starting NICE DCV server daemon...
Sep 23 12:58:40 ip-10-0-0-115 systemd[1]: Started NICE DCV server daemon.

I'm trying to access the page with http://<public ip>:8080 I've also tried including the #session_id part in the url and using the windows client with no luck.

My operating system is Ubuntu 20.04 with a custom AMI running in a g4dn.4xlarge machine.

  • Seems the core issue here was some incompatibility with Ubuntu 20.04. I was able to get it working just fine with Ubuntu 18.04. I'm sure it's possible to make this work with 20.04 since it's referenced in the Nice dcv docs, but the solution might be more involved. I'll leave the question open since the actual solution still hasn't been found.

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