Zwift not launching after Windows 10, 2004 update

Bugs and Support
1

Has anyone experienced Zwift not launching after w10 2004 latest feature update ?
Also tried re-installing, still not able to launch. Entries in Log file seems to be ok. Any ideas on how to get get back on Zwift

2

Are you experiencing the launcher crashing with one of :

  • Zwift encountered the following error: The underlying connection was closed: An unexpected error occurred on a send. Received an unexpected EOF or 0 bytes from the transport stream. If the problem persists please contact Zwift Support.
  • Zwift encountered the following error: The underlying connection was closed: An unexpected error occurred on a receive. The client and server cannot communicate, because they do not possess a common algorithm If the problem persists please contact Zwift Support.

My guess so far is that these are due to Zwift only implementing TLS 1.0 on their servers, and that the windows update now requires TLS 1.2. Iā€™ve found threads asking about this in these two places:

https://forums.zwift.com/t/enable-tlsv1-2-for-your-servers/11468

Iā€™m hoping that we can get Zwift to update their servers soon to address this issue, as I have not been able to find a workaround and could not uninstall the windows update (my computer is a work computer so certain updates were mandatory).

3

AFAIK, Microsoft has announced TLS 1.0 will be disabled no sooner then July 2020 .

Not that there is a reason Zwift wouldnā€™t move to TLS 1.2 (new worlds not withstandingā€¦ )

4

I finally figured out how to work around this. Enabling TLS 1.0 and 1.1 in Internet Explorer after the recent windows10 updates doesnā€™t seem to work, but enabling it in regedit key Computer\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.0\Client as in this link does work, at least for me:

2 Likes
5

Thanks for the update! :+1:

6

Thank you James, for feedback
The TLS 1.0 /1.1 reg update didnā€™t resolve the issue. There is absolutely no error messages, log file is also clean. The Zwift icon disappears after 10sec.

7

I am receiving the same ā€œunexpected EOF or 0 bytesā€¦ā€ error message. I have all TLS options ā€˜tickedā€™ in Explorer. Following the regedit path previously posted is not possible as there is nothing beyond ā€¦\protocols in my directory. Canā€™t get Zwift to run. :sob:

8

You need to add it manually and set dword32 Enabled value as 1. All is described step by step in the link provided above.

9

Hi Michal.

I have Windows 8.1 PRO and Iā€™m facing this problem. I made all changes with TLS 1.0 and 1.1 - still no working. Any ideas? Both of them should have value 1?
I will be very gratefull for help.

10

There is no good reason for you to still be using Windows 8.1, upgrade to Windows 10.

1 Like
11

Yes, both. Although Iā€™m not sure if Zwift didnā€™t finally change their TLS lately. Check your internet options (internet explorer) too. TLS (1.0, 1.1, 1.2 to be sure) should be selected there as well (Advanced > Security / Zaawansowane > Zabezpieczenia).

12

Iā€™ve just faced the same problem on Win10:

The underlying connection was closed: An unexpected error occurred on a send. Received an unexpected EOF or 0 bytes from the transport stream. If the problem persists please contact Zwift Support.

Iā€™ve downloaded the ZWIFT installer, installed it again (without previous uninstalling) and it works!

13

Hi all, I am facing same trouble but running with Windows Family 11. strange that in 2023, this is not well updatedĀ§? What I need to do? thanks for support. I go to Internet properties and selected TLS1.0/1.1/1.2/1.3 and error still appear ā€¦