L.S.,

Here at our company we are using WinCC Web Navigator Client version. But at regularly base, I get the message "Failed to load http://'server'/@screen.pd_" and then it will not start WinCC. My colleagues are able to open WinCC without problem.

What can I do for finding the reason for this problem?
Start the Web Navigator as admin is not possible, because I don't have the credentials.

Setup:

• Windows 11 => But with Win10 the problem was also there.
  Lenovo ThinkPad T14 Gen.1 model 20S1, 16GB memory
• Web Navigator Client Version: V07.05.10.05_01.07.00.02
  An update is not possible at the moment:
  * the application is maintained by the IT-department
  * a newer version for WinCC & Web Navigator is planned for next year, but has to be validated before use.
• Detail information found with 'task manager':
  * Digital signatures for WinCCViewerRT.exe: "Siemens AG (sha256) timestamp Tuesday December 8th 2020 12:23:25"
• Yes, the company PC is maintained by IT and a number of programs are started automatically at start-up of the laptop. I don't have the permission to stop (a lot of) these Applications.

What can I do (collect) for analising this problem?
In this way I can't support my colleagues or the customer using the data collected with the WinCC application.

Regards.
Willie

are you entering the login credentials on each opening of the webnavigator, or are they saved in the xml file?

in first case, if you use different logins, is for each of them in the WinCC user admin the webvavigator start page defined?

Alex.P

are you entering the login credentials on each opening of the webnavigator, or are they saved in the xml file?

in first case, if you use different logins, is for each of them in the WinCC user admin the webvavigator start page defined?

Hi Alex,

Normally I log in with my credentials saved in the xml-file, via a shortcut in the taskbar. At Wednesday I tried the route by entering the credentials at login, but that didn't work (same result as login via the shortcut). 

This week score is 40% working, 2 out of 5 days the load of the start-picture finished correct loading. When that is happening I'll keep WinCC started all day. The automatic log-off is functioning, but then the log-in is working without problems.

In addition to the advice of Raijin, who wrote:
"In this case I would recommend that you review the FAQ: What can you do if the WebNavigator or DataMonitor client does not connect to the server?  https://support.industry.siemens.com/cs/ee/en/view/109814515
Have a nice day."

• The compatibility of installed software: I've only installed WinCC at my laptop.
  The same like other users of the application.
  Only the engineers preparing and installing the PLC's an WinCC do have SW for WinCC development and TIA for PLC.
• As far as I understand, there is no encrypted communication.
• I can't start the WebClient as admin. (I don't have the admin credentials )
• Deleting the configuration files I have tried (rename them and then start WinCC direct from the app with entering my credentials) Doesn't help.
• Change the windows registry is not possible, when I want to start regedit it is asking for admin-credentials)

In addition to "does not connect to the server" ... In the logging-file  (WebNavReconnect_Session1.log) there is written: "12-4-2024 08:42:42   * Connected     Server(http://server)". But at the screen there is the terrible message "Failed to Load http://server/<Start screen>.pd_"

So my question is: Can I find somewhere logging or something else that can give me (or the experts here in the forum) some information why it is not working.
I would like to have this solved, because it is very annoying when a question from colleagues can't be answered for reason I can't open WinCC.

with regards,
Willie

 "Failed to Load http://server/<Start screen>.pd_"

does the user have a start screen defined?

can you delete all *.pd files and publish new?

before this, delete browser cache on the client PC, maybe some corrupt screen file there.

Alex.P

 "Failed to Load http://server/<Start screen>.pd_"

does the user have a start screen defined?

can you delete all *.pd files and publish new?

before this, delete browser cache on the client PC, maybe some corrupt screen file there.

 Alex,

In what way can this solve the problem?
As written, I do have a 40% score (2 out of 5 days) WinCC Web started as it should. So sometimes it is working and sometimes it is not...

• ...does the user have a start screen defined...
  how should it work if I haven't a start screen?
  
  
• delete all *.pd files .... Do you mean at the webserver?
  What about other users who are able to use WebNavigator for WinCC?
  
  
• browser cache?
  as I understand, WinCC WebNavigator is running under IE.... How can I delete the cache of IE?

Hello,

Did you found a solution for this issue? I have the same problem, the fault message is WinCC Web Navigator Failed to load ".../screeen.pd_"

Please let me know,

Nick

Hi Willie,

I have experienced the same issue exactly one month ago. The problem started after a Windows 10 Update. One (out of 3) WebNavigator Clients was displaying the same message. I tried different methods, but nothing followed by a positive result. Finally, I created a support request to Siemens and their answer was to check the above-mentioned checklist and most probably the solution would be to change the Reg-Keys (procedure described in the link): 

https://support.industry.siemens.com/cs/ww/en/view/109814515

I have not changed the Reg-Keys so far, because I asked the client's IT department to make a backup of the PC, before applying the changes in the registry.

Moreover, as a workaround, when the WebClient RT Viewer is run as an administrator it manages to load.

Best Regards,

Alex M

Is everything working well for you?