mappView VNCViewer "Failed when connecting"

[Lukas_Kimme]

Hi everyone,

I set up a project for tests with mappView in AS 6.1. Most things work well, however with the VNCViewer widget I failed to establish a connection to a VNC server.

In the widget, there is a progress indicator and a message
Failed when connecting: Server could not be reached, please check the network configuration and the server status - Connection closed(code: 1000) - Reconnection after 10s

I got this for a matrix of test cases: with/without authentication, port 5900/5800 on the server, server running on a PC (where it is accessible from another PC) vs server running on the PLC itself (VC4, server IP 127.0.0.1). In all these cases it was possible to connect to the server using a regular VNC client.

Anyone with ideas on this?

component versions:

• Automation Runtime 6.1.1
• mappView 6.1.1
• Visual Components 6.0.0
• OPC UA C/S 6.0.0

Thanks and best regards
Lukas

[job.franken]

Hello,

Did you enable the TCP proxy ?
It’s hidden in the advanced parameters. See attached screenshot.

[Lukas_Kimme]

Thanks for metioning the TCP proxy, I wasn’t aware of that. However, the behavior remains unchanged also with active TCP proxy. Tested with VC4 on PLC, using both 127.0.0.1 and 192.168.x.y where I can access the VC4 from my desktop at 192.168.x.y:5900 with authentification.

[job.franken]

My screenshot didn’t have a Role selected. But this is also mandatory.

Using the default “localhost” should work.

[hobi (Christian Hobelsberger)]

You did not directly mention it … but did you also configure the roles?
The VNC connection can only be established, if the currently logged in HMI user, has the configured role …

[Lukas_Kimme]

Thanks for your patience.

I saw the roles field before but couldn’t select any. Apparently the system roles are not available for this. So after your replies I created a dedicated role and with this, it is possible to connect

However, the behvaior still seems a bit odd. I am getting an empty/gray area in the widget most of the time, and only briefly there is a black area with a gray bar with a keyboard icon showing up at the top.

most of the time:

briefly:

PS: regarding system roles, the behavior makes total sense given that

The associated permissions are defined by B&R and cannot be modified.

[job.franken]

Could you check the logger if you see some errors related to VNC ?
Which browser are u using ?

[Lukas_Kimme]

Regarding browsers: Firefox + edge on Windows, and Chrome on Linux; same behavior with all of these.

Log after reboot, before logging into web UI:

Log after logging into web UI:

I think the OPC UA errors are not relevant here. When I open the page with the VNC widget there is no additional entry coming up in the logger.

[job.franken]

I could reproduce your error with a new project. Only after deleting the “Temp” and “Binaries” it worked as expected.

If you want I could upload my mini project.

[Lukas_Kimme]

Cool! In simulation the “Clean Configuration…” resolved this also on my side .

Still, this does not seem to work when deploying to an APC 2200, unchanged behavior in that case. Did you check with hardware, Job?

If you share your minimal setup, I will test with this.

[job.franken]

Just checked on real hardware to double check.

Attached is the sample
testMappViewVnc.zip (450.2 KB)

Tested with:

• AR 6.2.1
• mappView 6.1.1

and

• AR 6.3.2
• mappView 6.2.0

[Lukas_Kimme]

OK, this is what I observed:

• upgrade my project to AR 6.2.1: situation unchanged (working in simulation, not working with APC 2200)
• use your project with hardware replaced to APC 2200: working in both simulation and hardware
• (also with your project: connecting to a VNC server not on localhost is working)

So there seems to be something odd with my project. Unfortunately, I don’t have the time right now to look closer into this.

Anyways, thanks for your help @job.franken and @hobi, much appreciated! I will close this for now.