Solved I can't connect to webmeeting

[paurus]

When you open a link to your personal Click2Meet, an empty page opens in the browser. The same thing happens when you click on a link https://demo.3cx.net/webrtc/join/demo . If you look at the errors in the console, I see this:
12:57:08.77 - application - browsers Object
app.min.js?ver=10.5.10.26258:1 12:57:08.78 - application - detected browser Object
app.min.js?ver=10.5.10.26258:1 12:57:08.78 - application - detected browser: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.132 YaBrowser/20.3.1.195 Yowser/2.5 Safari/537.36 Object
app.min.js?ver=10.5.10.26258:1 12:57:08.100 - application - selected language is ru system language is ru
demo:1 Access to XMLHttpRequest at 'https://wm-cdn.3cx.net/10.5.26258/html/view.html?ver=10.5.10.26258' from origin 'https://demo.3cx.net' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource.
2angular.min.js?ver=10.5.10.26258:125 Error: [$compile:tpload] http://errors.angularjs.org/1.6.10/$compile/tpload?p0=html/view.html?ver=10.5.10.26258&p1=-1&p2=
at angular.min.js?ver=10.5.10.26258:7
at angular.min.js?ver=10.5.10.26258:163
at angular.min.js?ver=10.5.10.26258:137
at m.$digest (angular.min.js?ver=10.5.10.26258:148)
at m.$apply (angular.min.js?ver=10.5.10.26258:152)
at k (angular.min.js?ver=10.5.10.26258:103)
at s (angular.min.js?ver=10.5.10.26258:108)
at XMLHttpRequest.w.onerror (angular.min.js?ver=10.5.10.26258:109)
(anonymous) @ angular.min.js?ver=10.5.10.26258:125
DevTools failed to parse SourceMap: https://wm-cdn.3cx.net/10.5.26258/lib/angular.min.js.map
DevTools failed to parse SourceMap: https://wm-cdn.3cx.net/10.5.26258/lib/angular-route.min.js.map
DevTools failed to parse SourceMap: https://wm-cdn.3cx.net/10.5.26258/lib/ui-scroll.js.map
DevTools failed to parse SourceMap: https://wm-cdn.3cx.net/10.5.26258/lib/progressbar.min.js.map
DevTools failed to parse SourceMap: https://wm-cdn.3cx.net/10.5.26258/lib/angular-sanitize.min.js.map
DevTools failed to parse SourceMap: https://wm-cdn.3cx.net/10.5.26258/lib/angular-resource.min.js.map
DevTools failed to parse SourceMap: https://wm-cdn.3cx.net/10.5.26258/css/bootstrap.css.map

I checked it on different computers and different browsers.
I used different networks.
Google Chrome 80.0.3987.149
Microsoft Edge 80.0.361.69
Yandex 20.3.1.195 (64-bit)

When I go through the ios app webmeeting-it works great.

 

[LeonidasG_3CX]

Sorry to ask something basic like this, but have you tried clearing your cache? I've tried this tried replicating this with no success.

 

[paurus]

Thanks. Yes, I cleared the cache. I even specifically installed Microsoft Edge on another computer for verification.

 

[paurus]

I'm seeing this on three different laptops with Windows10 and with different browsers. One disconnected from the WiFi network and connected to LTE via an IPhone.

 

[aberry]

I'm having a few people seeing this issue today as well when trying to connect to webmeeting. Tried Chrom and fresh install of firefox. Here is a screen grab from chrome:

 

[paurus]

I'm having a few people seeing this issue today as well when trying to connect to webmeeting. Tried Chrom and fresh install of firefox. Here is a screen grab from chrome:

What country are your users located in?

 

[aberry]

We're in Washington State - US

 

[paurus]

We're in Washington State - US

So the problem is not in the country. We are located in Russia.

 

[paurus]

does anyone have any news on this?

 

[paurus]

I don't know why this is happening. I installed the opera browser 67.0.3575.115 and it works. In other browsers, the error described appears. Why is that?

 

[GLMCC]

We are also having a simlar issue.

On a pc/laptop the links will work fine.

On android mobile devices the links won't work in any browser. We just get a blank screen.

We have only just started using WebMeeting this week and are in the UK.

 

[JohnS_3CX]

We are also having a simlar issue.

On a pc/laptop the links will work fine.

On android mobile devices the links won't work in any browser. We just get a blank screen.

We have only just started using WebMeeting this week and are in the UK.

That's a separate matter entirely. iOS / Android require that you install our 3CX Webmeeting App

 

[JohnS_3CX]

@paurus and @aberry

Your cases seem to point towards network access issues.

Since Opera can open it, it does something differently. I believe Opera has a VPN built in it which changes the path it accesses the webmeeting servers.

To confirm visit this site from Chrome, and then from Opera at the same time - see if your IP changes depending on which browser you opened it in.
https://whatismyipaddress.com

 

[paurus]

@paurus and @aberry

Your cases seem to point towards network access issues.

Since Opera can open it, it does something differently. I believe Opera has a VPN built in it which changes the path it accesses the webmeeting servers.

To confirm visit this site from Chrome, and then from Opera at the same time - see if your IP changes depending on which browser you opened it in.
https://whatismyipaddress.com

The IP address does not change. Tested from three different networks. I disabled the VPN in Opera. Nothing has changed.

 

[paurus]

When you log in after clearing the cache, a window with the privacy policy appears. In the Opera, it is displayed and you can accept it and move on. There are no errors in the console. The policy window is not displayed in chrome and there is an error in the console.
has been blocked by CORS policy: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource.
it may be the case in the window of the privacy policy?

 

[JohnS_3CX]

It seems like the network path you use may alter or strip some information from the source, such that it triggers the CORS policy of the browser.

This could -potentially- be caused by your security settings, you HTTPS proxy sitting between you and the internet, your antivirus and or firewall. To isolate this I would propose a test if you are willing and have the time to carry it out.

 

[paurus]

It seems like the network path you use may alter or strip some information from the source, such that it triggers the CORS policy of the browser.

This could -potentially- be caused by your security settings, you HTTPS proxy sitting between you and the internet, your antivirus and or firewall. To isolate this I would propose a test if you are willing and have the time to carry it out.

Yes, I'm ready.

 

[JohnS_3CX]

A quick test:

Use a VPN client, there are a few free ones out there and few that allow you to try before you buy.
This is to bypass your local network restrictions. Try incognito mode on browser (don't load any extensions basically)

A remote test:
Try connecting to the meeting from home using your personal PC and home internet connection. This is
to avoid any firewall or specific antivirus or security policies you may have at your workplace

Alternatively,

Install a fresh copy of windows 10 (version 1909) on a free PC that you have. It does not need to be activated, just make sure its the original iso from microsoft and untouched from any Group policies.

Without any any antivirus software added or any changes made to windows, just install Chrome.
Connect the pc/laptop to a connection other than your corporate network, something like your home connection or something that is not behind a corporate firewall, if possible a connection from an internet provider that is different from the one you have at work. Try to enter the same meeting and see if it works

Try to use english for both instead of Russian, just so we can isolate any possibility of Localization getting in the way. Ensure that clocks and timezone are correct on the machine.

The main idea is to understand if there is anything in your network / firewall / antivirus that may be breaking the connection, since from here I can successfully connect to the demo session you posted above. I suspect that if you give me a link to your own meeting, I will again be able to connect without the issue that you face, feel free to send me a private message link if you want me to try it too.

 

[paurus]

JohnS_3CX
Thanks a lot. The problem was found. I need to disable the antivirus and then clear the browser cache. After that, it works! It remains to decide what to do with it.

 

[paurus]

Kaspersky. Turned off "Embed the script for interacting with web pages in traffic". Now everything is OK.