Mesh Agent wont install - The specified procedure could not be found

[masonb2002]

Describe the bug
When trying to install mesh agent on machine it gives a "The specified procedure could not be found" when clicking install or connect

To Reproduce
Steps to reproduce the behavior:

1. Go to Mesh Agent.exe
2. Click on install or connect
3. See error

Expected behavior
Expected to install and run mesh agent or temporary connection
Screenshots

Server Software (please complete the following information):

• OS: Ubuntu Server
• Virtualization:Proxmox
• Network: LAN/WAN hybrid with reverse proxy
• Version: 1.1.56
• Node: 18.19.1

Client Device (please complete the following information):

• Device: Laptop
• OS: Windows 11 pro 25h2
• Network: Remote over WAN
• Browser: Google Chrome

Remote Device (please complete the following information):

• Device: Laptop
• OS: Windows 11 pro 25h2
• Network: Remote over WAN
• Current Core Version (if known): unkown

Additional context
I have the agent running on two machines fine, but encountering issue with other machines.
Your sanitized config.json file
Please sanitize your configuration (remove private or irrelevant values) before posting, using the community tool at https://sanitizer.meshcentraltools.com/

{
  "$schema": "https://raw.githubusercontent.com/Ylianst/MeshCentral/master/meshcentral-config-schema.json",
  "__comment1__": "This is a simple configuration file, all values and sections that start with underscore (_) are ignored. Edit a section and remove the _ in front of the name. Refer to the user's guide for details.",
  "__comment2__": "See node_modules/meshcentral/sample-config-advanced.json for a more advanced example.",
  "settings": {
    "cert": "remote.bevnet.domain-1.com",
    "_WANonly": true,
    "_LANonly": true,
    "_sessionKey": "MyReallySecretPassword1",
    "port": 4430,
    "aliasPort": 443,
    "redirPort": 800,
    "redirAliasPort": 800,
    "AgentPong": 300,
    "tlsOffload": "10.0.0.79",
    "_ignoreagenthashcheck": true
  },
  "domains": {
    "": {
      "certUrl": "https://reverse.bevnet.domain-1.com:443/",
      "title": "REDACTED",
      "title2": "REDACTED",
      "_minify": true,
      "_newAccounts": true,
      "_userNameIsEmail": true,
      "agentInviteCodes": true,
      "agentCustomization": {
        "displayName": "REDACTED",
        "description": "REDACTED",
        "companyName": "REDACTED",
        "serviceName": "REDACTED",
        "_installText": "REDACTED",
        "image": "REDACTED",
        "fileName": "REDACTED",
        "_foregroundColor": "REDACTED",
        "_backgroundColor": "REDACTED"
      },
      "assistantCustomization": {
        "title": "REDACTED",
        "image": "REDACTED",
        "fileName": "REDACTED"
      }
    },
    "_letsencrypt": {
      "__comment__": "Requires NodeJS 8.x or better, Go to https://domain-2.com/ first before trying Let's Encrypt.",
      "email": "myemail@domain-3.com",
      "names": "REDACTED",
      "skipChallengeVerification": true,
      "production": false
    }
  }
}

[si458]

plz can you verify what BUILD number of Windows 11 pro 25h2 please?

[masonb2002]

26200.7705 is the build number I am on currently

[si458]

installs on 26200.7623 fine without any issues, so im guessing its the KB5074105 thats at fault,
can u try removing the KB5074105 package, restarting and installing the meshagent?
(im waiting for my slow ass VM to install the KB5074105 to prove its that first)
https://www.windowslatest.com/2026/02/05/after-kb5074105-windows-11-now-asks-for-admin-access-to-open-storage-settings-to-protect-your-files/
(but breaks Temporary files cleanup for some files/folders) <- title of article

[masonb2002]

I am currently unable to as the machine is at my house I will try this later today and to check.

[si458]

@masonb2002 dont worry ive verified here, installed the KB5074105, got the error, uninstalled KB5074105, installed no problem
microsoft broke something, so you MUST uninstall KB5074105 for the moment.
also another work around, installing from the command line still works meshagent64-mygroup.exe -fullinstall

[masonb2002]

Can confirm as well after doing this it fixed the issue.
Thanks for the help!

[Twilight-Computer]

Hit a similar problem today - brand new out of the box Lenovo ThinkPad P16s. No KB5074105 installed and running Win 11 Pro 25H2 (OS Build 26200.7840) - managed to install from Command line and may sort out several other machines that have been failing to install lately.
Info provided for reference only.

[si458]

@Twilight-Computer thank you for the update
FFS @microsoft what have you broken now !!!???

[Twilight-Computer]

Between Microsoft and Norton ( plus other AV's) - its been a messy few weeks... Regards, Gary Young | J.P. QBE | Twilight Computer Services P: +61 2 4022 9775 | M: +61 408 215 099 PO Box 4181, Bradbury NSW 2560 ***@***.*** | www.twilightcomputer.com.au MASTER SECURITY LICENSE 000108273 **** IMPORTANT INFORMATION ***** This document should be read only by those persons to whom it is addressed and its content is not intended for use by any other persons. If you have received this message in error, please notify us immediately. Please also destroy and delete the message from your computer. Any unauthorised form of reproduction of this message is strictly prohibited. Twilight Computer Services is not liable for the proper and complete transmission of the information contained in this communication, nor for any delay in its receipt. On 11 Feb 2026, at 21:26, Simon Smith ***@***.***> wrote:  si458 left a comment (Ylianst/MeshCentral#7606) @Twilight-Computer thank you for the update FFS @microsoft what have you broken now !!!??? — Reply to this email directly, view it on GitHub, or unsubscribe. You are receiving this because you were mentioned.Message ID: ***@***.***>

[si458]

so not sure how to fix this apart from uninstalling KB5074105 (End of Jan 26) and KB5077181 (Feb 26)
it appears to be something wrong with the ShellExecuteExW/ShellExecuteW functions which are used to call the UAC
this is required for Admin permissions to install the service
if anybody wants a crack at it and try helping me (ive tried 3 different AIs and they all keep failing to work 👎)
the function RunAsAdmin is where it appears to be failing 👎
https://github.com/Ylianst/MeshAgent/blob/add1d7fef3b341a3474fbce86cdab54ddcde2af9/meshservice/ServiceMain.c#L191-L205

[silversword411]

Here's a good step along the way
https://github.com/silversword411/MeshAgent/tree/2026-2-fix-UAC