This has been a long-standing issue with the license manager in the ERAS. I've already got a ticket open with ESET on this (since last year), but I wanted to post here so everyone is aware in case they've run into the same issue. The ERAS license manager only allows you to upload Windows Business Edition licenses, not Linux licenses. However, we have both Windows and Linux machines in our company, all of which are using ESET antivirus products and all of which "phone home" to the ERAS for statistics and alert tracking. The problem is that when a Linux client connects to the ERAS, the ERAS assigns a *Windows* license to it. This means we end up running out of Windows licenses on the ERAS, which starts to cause issues. The only work-around I'm aware of at this time is for ESET to issue you a batch of Windows Business Edition license of equivalent count to your Linux licenses. In our case, we have about 400 Windows clients and 400 Linux clients. So for us, we end up getting 400 Linux licenses, and 800 Windows licenses assigned to us. This means all 800 of our clients (both Windows and Linux) get assigned a Windows licenses in the ERAS. I started using the ERAS with version 3.1.11, and this problem existed then and still exists with the latest ERAS 4.0.136.