Question about the network serial console

So for my CSR1000Vs (Cisco virtual routers) being run in ESXi, I had it set initially to enable network serial console, allowing me to input something in the syntax of [URL]telnet://192.168.1.15:2001[/URL], where the port number is the VM that I can remote into as if it were from the console. However, after putting in my license, I can no longer do this. I checked the security configuration and the "VM serial port connected over network" was still checked, as this was what I was supposed to enable to be able to remote successfully. Is there a certain license feature that is omitted from the base license that's preventing me to do this?
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CSR1000v Serial Access ESXi 5.5 - IEOC - INE's Online Community
My Sonicwall TZ 210 solved that problem for me.
I'm considering a Fortigate right now, as they're leader in the industry, between the 30D or 60D, when I have the money. Preferably the 60D, as it can act as a WLC or standalone, so expansion is possible (With the walls in my house, I'm starting to consider a couple APs with WLC/router in the house rather than one wireless router).