B4J Question [ABMaterial] Problem with loading the page

[MichalK73]

Hello.
I wrote a simple webapp for a client, however, I have a rather strange problem with which I first met. The point is that a small percentage of people do not load the page. Stops on the loading animation. I turned off the gzip because I suspected that maybe it does affect but it did not help. To be sure, I have replaced all the css, font, js libraries, because maybe one of them was damaged when copying.
What else can I do to locate the error?

 

[Harris]

https://www.b4x.com/android/forum/threads/abmaterial-for-dummies-beginner-lessons.88346/#post-609895

 

[MichalK73]

All conditions have been met, but still approximately 5-10% of users do not load the site.

 

[alwaysbusy]

I see most of the files are 'from memory'. Have you tried disabling the cache (checkbox in top bar) and pressing CTRL + F5?

Also, check the console in the browser: do you see errors?

 

[MichalK73]

Error

 

[alwaysbusy]

This looks more like a firewall issue on the clients side: maybe they are blocking websocket connections, or they are not configured to handle websocket connections.

 

[MichalK73]

Actually. Now I have checked another server placed with ABMaterial and it is the same.
Can you get around this somehow?

 

[alwaysbusy]

No, that would make their firewall useless. They have to explicitely allow it. Do you use a specific port where you run your webapp on? We always make sure our apps run on port 80 and 443 (defaults http and https). For these ports, most firewalls are set to allow websockets.

 

[MichalK73]

Well, I know that ports 80 and 443 should be unlocked for a proxy server for websockets and such ports are set in webapp but apparently there are other filters that do not allow such connections.

 

[MichalK73]

Solution.
The use of SSL certificate helped. Now the page goes through the firewall.