You should be able to change this as detailed below:
View clients now follow the well-known browser model for handling certificates, displaying errors detected in the certificate presented by View Connection Server, or in the certificate trust chain. Administrators can set the Certificate verification mode group policy to enforce strict certificate checking; if any certificate error occurs, the user cannot connect to View Connection Server. Alternatively, administrators can use the default Warn But Allow mode, which supports self-signed server certificates and lets users connect to View Connection Server with certificates that have expired or are not yet valid. If necessary, administrators can also set a No Security mode that lets users connect without certificate checking.
More details here: http://vinfrastructure.it/en/2011/12/vmware-view-5-certificate-warning/
Blog: http://blog.eeg3.net
