Secomea GateManager 8250 Release 9.1B and Secomea GateManager 4250/4260/9250 Release 9.0F

Here are the highlights of the GateManager 8250 9.1B and 4250/4260/9250 Release 9.0F

• Update Let's Encrypt support to ACME v2 (RFC 8555) - you can now generate free SSL      certificates again via the GateManager.
• Fixed broken noVNC  (8250 only)