After connecting to windows vpn,while doing rdp, are you getting the error “ Because of an error in data-encryption,this session will end” as shown below :
Fix :
Please check if you have any Sonic Wall Global VPN client old instance exists in your windows box and remove/uninstall the same to avoid the above error and now you can rdp successfully.
But if you need both sonic wall and windows vpn client for your work, then just start the Sonicwall vpn client without actually connecting to sonic wall vpn server and in the mean time just try to connect the windows vpn to remote,which should work fine like a charm as it worked fine for me.
N.B : Actually data encryption provides security to data while traveling over network connections,so data encryption error can disrupt our session for security reasons but in our case the sonic wall global vpn client is breaking RDP over PPTP connections causing the issue.