Dear Ouassim95,
Shahidhussain is correct in that the best practice article which he linked to NEEDS to be followed in order for our product to work well on VMWare.
The most common cause of this issue is the VMWare network card configuration for the VM.
The solution : Do not use VMXNET3. Please use the E1000 adapter or the flexible network adapter.
For more details, please see the following tech article, Symantec Encryption Management Server (previously PGP Universal Server 3.x) text-based installer does not ask for network configuration details - http://www.symantec.com/docs/TECH192173
Please let me know if this suggestion resolves the issue, or if you require additional assistance or clarification. I'll be happy to help.
Best Regards,
Phil