Getting SSL protocol errors multiple times per day on file hosting

File Service
1

We are hosting a web app using Backendless file hosting, and sometimes when users try to access the entry point (a HTML file), they get a SSL protocol error, where Chrome says “This site can’t provide a secure connection: *** sent an invalid response. ERR_SSL_PROTOCOL_ERROR”. I am getting reports of this multiple times per day.

Is this a known issue, and if so is there anything that can be done to ensure that this doesn’t happen in the future? If not, we are going to have to look into an alternative host for the frontend and file portion of the app since we can’t have this sort of error happening this often.

2

This may happen if the files downloaded/accessed by your application use our generic backendlessappcontent.com domain name. Since we had malicious users deploying some garbage in their apps (which we promptly identified, removed and blocked the users), some systems still blacklisted the domain. As a result, it impacts other, perfectly valid apps like yours.

As workaround for this issue is to either use a custom domain registered with your Backendless app, or a xxxxx.backendless.app subdomain assigned to your app.

Regards,
Mark

3

In this case people are accessing the app via the custom domain, not backendlessappcontent.com and are still getting the error occasionally. I have asked them to report the specific times it comes up for future occurrences.

4

While the app itself is accessible via custom domain, images referenced by the app may be downloaded through backendlessappcontent.com. I recommend checking the Network tab in browser DevTools to make sure the domain name is not used anywhere in the app.

5

I looked at the inspector and am seeing the images at referenced at the ***.backendless.app domain. However the error is occurring for loading HTML content as well, not just images.

6

Could you share test login credentials with us for the site?

7

Is there a way I can do that privately?

8

Certainly, you can send me a private message (click my name, and there should be a Message button). Or send me an email at mark@backendless.com