Kaspersky blocks uploads Google Drive (only Firefox) [Closed]

  • 8 November 2019
  • 9 replies

This week I couldn’t upload big files on Google Drive with Firefox.  With Chrome all went well.

Even after deleting the cache and disabling all extensions, it didn’t work.

Though I didn’t think Kasperky would be the cause, I disabled Kaspersky and the upload succeeded!

I found out that I had to disable Network -> Scan secured traffic Firefox and Thunderbird.

So, my problem has been solved, but I mention it in case other members encounter the same problem.

This topic has been closed for comments

9 replies

If there is a better solution, I like to hear it! :slight_smile:


Userlevel 7
Badge +11

Hello   @KlaasV,


I’d like to test.

  1. Operating system name? version? build?
  2. KIS version? & patch?
  3. FF, name? version?
  4. FF, is Kaspersky Protection installed? If “yes”, version?
  5. When the upload failed, were there any errors in the browser or KIS? If “yes”, please detail the errors?
  6. Re: “Scan secured traffic Firefox and Thunderbird”, did you de-select Scan secure traffic in Mozilla applications



Please post back?

Thank you:pray_tone3:


1. Windows 10 – 32 bits, Version 10.0.17763 Build 17763

2. Kaspersky KIS (e)

3. Firefox 70.0.1 (32 bits)

4. Firefox Kaspersky Protection installed, version 30.0.3762.27d-20190319165301.

5. No error messages in KIS.

6. Yes, I de-selected “Scan secure traffic in Mozilla applications”. With success. 

Userlevel 7
Badge +11

Hello @KlaasV,

Thank you for posting back and the information:pray_tone3: .

How big were the uploads please? *Edit* I thought I asked that question, but I can’t see it in my original reply, sorry!

Thank you. 

Yes, the size did matter. The file size was 207 Mb. Uploading a photo of 1 Mb went well.

Userlevel 7
Badge +11

Hello  @KlaasV,

Thank you for posting back:pray_tone3:

Yes, the size is the basis of the test.

I’ll let you know my results.

Best regards

Previous week I installed an update of Windows 10 (version 1909, release 18363).

Today I checked if the bug still existed.

So I selected “Scan secured traffic Firefox and Thunderbird”, Scan secure traffic in Mozilla applications


The upload went fine, this time!
I don't know if this happened by a bug correction of Kaspersky, Google Drive, Firefox or Windows 10…

Userlevel 7
Badge +11

Hello  @KlaasV,

Thank you for the update:pray_tone3:

Was Scan secure traffic in Mozilla applications, not selected before? 

& is Mozilla certificate store selected?

(I have not been able to replicate the problem).

Please let me know?

Thank you


Till yesterday I had deselected “Scan secure traffic in Mozilla applications”.

I selected “Windows certificate store” (again). (Settings as your picture above).