Please refer to the documentation:  

https://cgi.ptvgroup.com/vision-help/LicenseMgt_ENG/Content/License-mgt/Cloud-license-test.htm

When using cloud licenses in conjunction with a proxy, this proxy must not break SSL certificates in any way.

If a network firewall monitoring SSL connections is involved, WIBU Cloud may need to be white-listed. The all-in-one solution not requiring active maintenance is to introduce an exception for *.wibu.cloud via wildcard when inspecting HTTPS connections.