Last year, around May, DynDNS.com has changed their root certificates, causing Dynamic DNS using DynDNS.com no longer to work properly. The error (Network Error) is displayed immediately after adding the account to your Sonicwall.
The easiest solution is to upgrade to the latest firmware:
Dell Support also offers an alternative, although this only works with more recent 5.9 versions:
Before installing ROK licenses on your virtual machines on VMware, be sure to allow SMBios reflection of the host to the VM's. Otherwise, authorization will fail with a This system is unsupported message.
To do this, go to the settings of your newly created VM. Click the tab Configuration, then click General, then the button Configuration Parameters. Add a new row:
SMBIOS.reflectHost = TRUE
A note about installing the drivers for the Dell PowerVault TL2000/4000 on a Windows 2012 machine.
You can download the firmware from the Dell Support website. After extracting the package, do not install the driver using Device Manager. Doing so will not properly install the drivers (results in error code 37). Instead, install them using the included executable (install_nonexclusive.exe). Running this (elevated) will install the drivers the proper way, and the devices will start correctly.