Summary: Discusses Windows security settings and how it effects license validation.
Enable PKCS Key Exchange Algorithm by setting the Enabled value of the following registry key to 0xffffffff.
Hive: HKEY_LOCAL_MACHINE Key: SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\KeyExchangeAlgorithms\PKCS Name: Enabled Type: REG_DWORD Value: 0xffffffff
A recommended Windows Security setting interferes with validating licenses in the LAN Zoo on Windows Server 2012 R2, 2016 and 2019.
If PKCS is disabled, the LAN Zoo cannot connect to the McNeel Validation Server.
Setting the Enabled value to 0xffffffff (or deleting it) is enough to get things working again. The default value for Enabled is 0x0.