Can't connect to school network VPN

[LakesideLion]

I'm using a Mac running OS X  High Sierra and am having trouble connecting to our school with VPN from home.

I have comcast using a Arris SBG6580 as my wireless router.  When I try to connect I get the L2TP-VPN server did not respond.  If I connect my iMac to the net through my Phone's hotspot it works great.  I connect no problem.  So something in my SGB6580 seems to be blocking the communication.  Anyone else encounter this?

[LakesideLion]

Well, I think I've narrowed it down to my wireless router.  I turned off the firewall on it so nothing should be being blocked and still I can't connect.  I'm not sure what I'm going to tell our faculty and staff if they encounter this at their home.  If anyone has any ideas it would be greatly appreciated.

[PhilipDAth · Accepted solution]

Buy some Cisco AnyConnect licences, and change over to using that.  It is much more reliable.

https://documentation.meraki.com/MX/Client_VPN/AnyConnect_on_the_MX_Appliance 

Also make sure the subnet you are using at school and the subnet you are using at home is different.

[LakesideLion]

Sucks not knowing why it doesn't work.  I was hoping to learn more about vpn technology and protocols but going to AnyConnect worked.