"the add-on could not be downloaded because of a connection failure"

system · 2015-03-30T11:26:46.000Z

Hi, when trying to download HTTPS Everywhere, any stable version (all I tested it on), I received the following notification from my Firefox Browser:
“the add-on could not be downloaded because of a connection failure”

I disabled all Avast shields for 10 minutes, and then the download worked.

What is the cause of this problem, and what is the solution, besides disabling shields temporarily?

Thanks.

Edit: I have Windows Firewall, running Windows 7, in case that is of importance in regards to this question.

Asyn · 2015-03-30T11:51:33.000Z

Which Avast…? (Free/Pro/IS/Premier)
Which version…?
OS…? (32/64 Bit…? - which SP…?)
Other security related software installed…?
Which AV(s) did you use before Avast…?

system · 2015-03-30T15:10:13.000Z

Which Avast…? (Free/Pro/IS/Premier)
Which version…?
OS…? (32/64 Bit…? - which SP…?)
Other security related software installed…?
Which AV(s) did you use before Avast…?
Free
2015.10.2.2214
Windows 7; 64 bit; SP1
Windows Firewall
None

Eddy · 2015-03-30T15:18:01.000Z

Perform a clean installation of the latest avast version and see if the problem still is there:
https://forum.avast.com/index.php?topic=168680.msg1199245#msg1199245

system · 2015-03-30T21:57:51.000Z

I did the reinstall and the problem is still there.

Asyn · 2015-03-31T04:34:11.000Z

Disable HTTPS-scanning in the web shield. Does it work now…?

system · 2015-03-31T09:16:52.000Z

Yes, disabling HTTPS scanning in, ‘settings → active protection → web-shield → customisation’, fixed the problem, thank you Asyn.

Asyn · 2015-03-31T09:22:30.000Z

You’re welcome.

bob3160 · 2015-03-31T11:49:09.000Z

In my eyes, this isn’t a fix but a bypass. I’ve reported this to the Moderates and hope we’ll get an answer as to when the problem will be fixed.

Asyn · 2015-04-01T04:42:07.000Z

bob3160 post:9:

In my eyes, this isn’t a fix but a bypass.

Yes, it’s a workaround.

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