Openconnect won't connect in Arch Linux

I have been having some problems with openconnect in my Arch Linux (Antergos to be precise) and I have no idea what's causing it. (Although I'm used to linux and all, I'm very new to VPNs and openconnect.) I'm trying to connect to my University's VPN via 2 methods. I start by following the instructions, which simply say to create a Cisco AnyConnect Compatible VPN and input the name and gateway. When I do it this way and try to connect via the network-manager applet it doesn't work. When I flip the VPN switch it simply flips right back immediately and that's it. No error messages or anything. The second approach I'm trying is via command line. So I try this $ sudo openconnect -u myusername my.gateway.edu *(I'm replacing the actual gateway with my.gateway.edu and also the username and blurring relevant IPs from now on)* This is the log I get from that input: POST https://my.gateway.edu/ Connected to 164.**.**.**:443 SSL negotiation with my.gateway.edu Server certificate verify failed: signer not found Certificate from VPN server "my.gateway.edu" failed verification. Reason: signer not found To trust this server in future, perhaps add this to your command line: --servercert sha256:bb2476a96b88357fe74f28a347ba549a2af4bea8668e30a77e1a8295f466bfdc Enter 'yes' to accept, 'no' to abort; anything else to view: yes Connected to HTTPS on my.gateway.edu Got HTTP response: HTTP/1.1 401 Unauthorized Error generating GSSAPI response: gss_init_sec_context(): Unspecified GSS failure. Minor code may provide more information gss_init_sec_context(): SPNEGO cannot find mechanisms to negotiate Server 'my.gateway.edu' requested Basic authentication which is disabled by default GET https://my.gateway.edu/ Connected to 164.**.**.**:443 SSL negotiation with my.gateway.edu Server certificate verify failed: signer not found Connected to HTTPS on my.gateway.edu Got HTTP response: HTTP/1.1 401 Unauthorized No more authentication methods to try GET https://my.gateway.edu/ Please enter your username. POST https://my.gateway.edu/auth Please enter your password. Password: POST https://my.gateway.edu/auth Got CONNECT response: HTTP/1.1 200 CONNECTED CSTP connected. DPD 90, Keepalive 32400 Connected as 169.**.***.**, using SSL DTLS handshake failed: Resource temporarily unavailable, try again. Failed to open tun device: No such device Set up tun device failed Unknown error; exiting. I have asked the University's IT support but they also don't know what's happening (I think they're not very familiar with Arch Linux). I have tried some other things such as using the flag --script /etc/vpnc/vpnc-script but the result is the same. __EDIT__ I have recently come across [this website](https://medium.com/@v4runvs/using-openconnect-instead-of-cisco-anyconnect-vpn-agent-d7bc7d9b1631) via the IT people that says that I have to create a tunnel device before connecting. Even after doing that the results of sudo openconnect -u myusername my.gateway.edu --interface tun1 are still the same.