Can't Get Licencing Response From Browser

Rhino
,
1

After manually uninstalling and reinstalling Rhino 8 while troubleshooting a series of full system crashes related to amdkmdag.sys, I am now completely unable to sign in and access my license, with this error:

Screenshot 2025-10-15 163433
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I have made sure that all related applications are allowed through the firewall, and it hasn’t fixed anything, so now I’m at a loss.

2

Hi jsb.walker,

Looking into this, there was a similar report earlier today. We ended up validating standalone so they could get their urgent work done. Are you certain there are no active firewalls on the pc or router?

3

If not actively blocked it could also be caused by other software using the ports (1717, 1718 and 1721)

4

After trying again on my home network instead of at work, I can say that there shouldn’t be any firewalls blocking access. I’ve also checked the ports and 1717, 1718, and 1721 are not in use.

5

Did last nights windows update get installed? That is the common denominator so far (3 cases)

6

Actually, yes. The recurrent graphics driver crash that prompted me to start all this resulted in the latest windows update finishing installing when it rebooted.

7

I can confirm that this is the cause of the issue. I uninstalled the latest security update and was able to pass the license into Rhino again.

Now I just need to figure out why my computer is BSODing 15-30 seconds into rhino using my graphics card instead of the onboard graphics.

8

Thanks @jsb.walker for helping out. If you’ve got some extra time, would you mind reinstalling the windows updates and see if they break Rhino again? There are some unconfirmed reports of users being able to run Rhino again after reinstalling the updates even though it broke Rhino the first time.

9

For anyone else, here is the error and recommended actions until Microsoft sends out a hot fix.

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  • It appears Microsoft has broken the functionality in Rhino 6-8 needed to login to Rhino with their latest Windows updates (KB5066835 and KB5065789 ). The symptom is the error message attached.
  • In order fix this problem, please have users uninstall both of them by either:
    • Running wusa /uninstall /kb:5066835 and wusa /uninstall /kb:5065789 on an admin command prompt.
    • Uninstalling these two updates via the UI.
10

Hmm, Windows updated yesterday here and installed KB5066835 (but not KB506578 as far as I can tell). So far no problem with accessing my cloud zoo license on my V7 or V8 installs - it says “license obtained…” So I guess this is not a universal problem?

11

No not universal, 6-8 instances so far (one in-house), there are also recent reports that a windows defender update resolves the issue.

https://www.microsoft.com/en-us/wdsi/defenderupdates