To ensure proper communication and license checkout, FlexNet components must follow this specific version hierarchy (from newest to oldest): LMTOOLS / lmutil (License Admin Tools) lmgrd / lmadmin (License Server Manager) Vendor Daemon for Autodesk, for Siemens) Client Library (Linked to the software application) License File Format

Check your software vendor’s documentation. For major software:

Consider commercial license management overlays (e.g., OpenLM, Flexera’s own License Server Administration Console). These tools can automatically detect version mismatches and even proxy requests to mask minor version differences (though not major API jumps).

Some organizations use FlexNet proxy tools that cache licenses. If the proxy is running an old FlexNet API, it will reject newer clients even if the backend server is up-to-date. Upgrade or bypass the proxy.

The "flexnet licensing version of client newer than server" error is not a bug—it is a feature of FlexNet’s security model. It prevents API mismatches that could lead to license corruption or security exploits. However, for the end-user, it is a productivity-killing roadblock.

If the path is wrong, FlexNet falls back to a different (older) daemon in your $PATH .

If a v8 client (introducing the LM_A_DUP_GROUP duplicate license handling) connects to a v7 server, the server may interpret the packet’s field offsets incorrectly, leading to a -95, 410 error: "Incompatible version number." The server returns an LM_VER_INCOMPATIBLE error before any license is processed.

Siemens NX and Teamcenter use splm or ugslmd . Their documentation explicitly states: "The license server must be at the same version or newer than any client attempting to connect."

If your client application (e.g., AutoCAD 2026) was built using a newer FlexNet SDK than the server's lmgrd or vendor daemon, the server cannot understand the request, and the connection fails. Step-by-Step Troubleshooting Guide 1. Verify Current Versions