In some cases when using proxy servers in order to extend Plaxis licences on the CodeMeter key, it could fail or give warnings.In case of experiencing problems with this issue, please contact PLAXIS Support.
A work around could be to update the CodeMeter licences via PLAXIS Connect outside a network that uses proxy servers.
This has been fixed since PLAXIS 2D 2011.00 and PLAXIS 3D 2011.01