Installer Gets Error Code -1

Trying to do an install on a Server, the Logs shows “Next stage installer returned with code -1” then it stops. On the Screen it states
Exch Installer Error
Error trying to create device. Please contact support for assistance.

What version of Windows Server? Check your Syncro console, did the asset appear anyway?

Server 2012 R2 and it has not shown up.

Brand new server? I think there are some .net requirements. Do your updates first.

Added (I would hope this is not a new install)

I know Syncro does work on Server 2012.

Upgrade to .net 4.8 (4.6.2 is required iirc) and make sure you can access these servers.


For servers, I’d definitely suggest checking .NET as your first step.

Generally, this is a communication error. When checking the install logs you’ll often see “The request was aborted: Could not create SSL/TLS secure channel.” Logs for the installer are located on the asset under C:\ProgramData\Syncro\logs

Other things to check…
• Is this being installed on a supported OS? Install a Syncro Agent on a Device
• Is .NET 4.6.2 or higher installed and updated?
• Configure the whitelist:
Syncro Exceptions and Allowlists
• Ensure you’re using a new installer, if you’re installing from a file you’ve downloaded some time ago, download a fresh one by clicking ‘Add Asset’ from the Asset page.
• Attempt installing in another way, if you were using the EXE try the MSI and if the MSI, try the EXE.

If you need to do a fresh reinstall, an uninstallation tool can be found at the bottom of this page- you will need to reboot after uninstalling. Install a Syncro Agent on a Device


I’m seeing the same issue on 2 windows 10 machines. .net installed 3.5 and 4.8 and OS is fully updated, also have it on a 2012r2 server but that’s going to be shut down soon so we gave up on resolving that.

Cloudflare DNS is blocking Syncro and also causing this error, just in case you are using their DNS.

This was very helpful, I set my DNS to Google and I could install agents again. we have not been able to install agents for 2 weeks.