We've experienced that Z3s upgrading to MX 18.107 (from 17.02.10) are unable to pull a DHCP lease on port 5 (the PoE port) on the Z3 appliances post-upgrade. Rolling the impacted appliances back to the prior release (17.02.10) fixes the issue, and re-attempting upgrade to 18.107 reintroduces the same behavior on Z3s with DHCP clients on port 5 only unable to pull a lease once again. Other ports (1-4) are curiously not impacted. Opening a support case on this, but just warning the community of this issue. ... View more