PackageManager - The SSL connection could not be established

cfee · March 16, 2026, 10:58am

any suggestions, as package manager won’t load. Worked before. Didn’t run any recent update, both rhino nor windows

Rhino 8 SR29 2026-3-4 (Rhino 8, 8.29.26063.11001, Git hash:master @ bbd126f84fcdaf7a974615b7c9f4f8667571c147)
License type: Commercial, build 2026-03-04
License details: Cloud Zoo

Windows 11 (10.0.26200 SR0.0) or greater (Physical RAM: 64GB)
.NET 7.0.0

Computer platform: LAPTOP  - Plugged in [100% battery remaining]

Non-hybrid graphics configuration.
  Primary display and OpenGL: NVIDIA GeForce RTX 3080 Ti Laptop GPU (NVidia) Memory: 16GB, Driver date: 11-6-2024 (M-D-Y). OpenGL Ver: 4.6.0 NVIDIA 566.14
    > Integrated accelerated graphics device with 4 adapter port(s)
        - Windows Main Display is laptop's integrated screen or built-in port
  Primary OpenGL: NVIDIA GeForce RTX 3080 Ti Laptop GPU (NVidia) Memory: 16GB, Driver date: 11-6-2024 (M-D-Y). OpenGL Ver: 4.6.0 NVIDIA 566.14
    > Integrated accelerated graphics device with 4 adapter port(s)
        - Windows Main Display is laptop's integrated screen or built-in port

Secondary graphics devices.
   Intel(R) Iris(R) Xe Graphics (Intel) Memory: 1GB, Driver date: 1-27-2022 (M-D-Y).
    > Integrated graphics device with 4 adapter port(s)
        - There are no monitors attached to this device. Laptop lid is probably closed

OpenGL Settings
  Safe mode: Off
  Use accelerated hardware modes: On
  GPU Tessellation is: On
  Redraw scene when viewports are exposed: On
  Graphics level being used: OpenGL 4.6 (primary GPU's maximum)
  
  Anti-alias mode: 4x
  Mip Map Filtering: Linear
  Anisotropic Filtering Mode: High
  
  Vendor Name: NVIDIA Corporation
  Render version: 4.6
  Shading Language: 4.60 NVIDIA
  Driver Date: 11-6-2024
  Driver Version: 32.0.15.6614
  Maximum Texture size: 32768 x 32768
  Z-Buffer depth: 24 bits
  Maximum Viewport size: 32768 x 32768
  Total Video Memory: 16 GB

Rhino plugins that do not ship with Rhino
  C:\ProgramData\McNeel\Rhinoceros\packages\8.0\LadybugTools\1.38.234\Ladybug.RH.Loader.rhp	"Ladybug.RH.Loader"	1.38.234.0
  C:\ProgramData\McNeel\Rhinoceros\packages\8.0\Pollination\1.52.20\Pollination.RH.Loader.rhp	"Pollination.RH.Loader"	1.52.20.0

Rhino plugins that ship with Rhino
  C:\Program Files\Rhino 8\Plug-ins\Commands.rhp	"Commands"	8.29.26063.11001
  C:\Program Files\Rhino 8\Plug-ins\rdk.rhp	"Renderer Development Kit"	
  C:\Program Files\Rhino 8\Plug-ins\RhinoRenderCycles.rhp	"Rhino Render"	8.29.26063.11001
  C:\Program Files\Rhino 8\Plug-ins\rdk_etoui.rhp	"RDK_EtoUI"	8.29.26063.11001
  C:\Program Files\Rhino 8\Plug-ins\NamedSnapshots.rhp	"Snapshots"	
  C:\Program Files\Rhino 8\Plug-ins\MeshCommands.rhp	"MeshCommands"	8.29.26063.11001
  C:\Program Files\Rhino 8\Plug-ins\IronPython\RhinoDLR_Python.rhp	"IronPython"	8.29.26063.11001
  C:\Program Files\Rhino 8\Plug-ins\RhinoCycles.rhp	"RhinoCycles"	8.29.26063.11001
  C:\Program Files\Rhino 8\Plug-ins\Toolbars\Toolbars.rhp	"Toolbars"	8.29.26063.11001
  C:\Program Files\Rhino 8\Plug-ins\3dxrhino.rhp	"3Dconnexion 3D Mouse"	
  C:\Program Files\Rhino 8\Plug-ins\Displacement.rhp	"Displacement"	
  C:\Program Files\Rhino 8\Plug-ins\SectionTools.rhp	"SectionTools"

wim · March 16, 2026, 11:46am

Dag Chris -

Could you run Rhino with logging enabled and send us the text file that is produced?
→ Enable Debug Logging in Rhino for Windows [McNeel Wiki]
-wim

cfee · March 16, 2026, 11:55am

RhinoDebugMessages.txt (30.0 KB)

RhinoDotNetTraceLog.txt (1.2 MB)

cfee · March 16, 2026, 11:57am

installing a yak file by just drag n drop works.

I tried switching between NETCore and NETframework v8 / v7, doesn’t change anything

cfee · March 19, 2026, 7:29am

Hi @wim, do you have any updates on this topic yet?

I uninstalled rhino and reintalled it, but sll connection error stays.

cfee · March 30, 2026, 9:18am

anyone else at rhino can give me advise. Seem it’s related to some setting in my browser/windows system

Even after full uninstall, including all left-over folder and reinstall, i still get this message that SLL connection cannot be established.

I tried it with R9 WIP, and that also doesn’t load.

wim · March 30, 2026, 9:45am

Dag Chris -
We have a person in the Barcelona office with the same issue and have been trying to figure that out. We added more information in debug logs in 8.31 but so far that hasn’t helped fixing this.
I’ve added this conversation to the thread.
-wim

cfee · March 30, 2026, 10:15am

Ok, thanks for the update.
what i tried thus far (unsuccessfully)

SetDotNetRuntime, changed from NETCore to NETFramework (or vice versa)
windows firewall > added outbound rules for Yak and Rhino exe
set windows time to automatically instead of manual (for sll handshake)
in browser I can see txt file in https://yak.rhino3d.com/info
run as admin command “certutil -urlcache * delete” to clear .NET cache
network & internet proxy: turned On / Off “Automatically detect settings”
Check if it was related to having software like Python (Anaconda), Git, or curl is installed, run in PowerShell “Get-ChildItem Env:SSL_CERT_FILE, Env:CURL_CA_BUNDLE, Env:REQUESTS_CA_BUNDLE -ErrorAction SilentlyContinue” but result was blank
UncheckedCheck for publisher's certificate revocation +

Check for server certificate revocation in Internet Properties
I don’t have VPN or 3rd-party antivirus

cfee · March 30, 2026, 10:45am

….

Seems i was to optimistic only seems ti work for couple of seconds after a windows restart. so possible the above had nothing to do with it

all in R8 SR29

jeremy5 · March 30, 2026, 11:32am

It is possible that McNeel are doing something with security at their end. There’s another issue (albeit with 8.30) here: Bongo fails to load in latest Rhino 8 release

cfee · March 30, 2026, 12:07pm

@wim it’s a long shot but it seems to be related to Intel Killer Performance Suite. It intercepts SSL handshakes to see what kind of data is being sent so it can prioritize games. When I disabled the Prioritization Engine i could load the Package Manager and install all needed plugins

Open the Killer Intelligence Center
Go to the Settings
Turn OFF the Killer Prioritization Engine.
Turn OFF Auto Bandwidth if it is on.
Restart Rhino and test.

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PackageManager - The SSL connection could not be established

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