Blocked for the first time

sanman96

I travel to corporate offices quite a bit for my job to do on the fly coding for clients. To do this I use a personal OpenVPN server that has been up and working great for about a year. For the first time while at a client's my vpn was blocked and I could not access the my rdp and ssh tunnels to update and code webpages on the fly. The vpn is setup to run on tcp over port 443. The log will be listed below. I am not asking for a solution (one would be nice though) but more of an explanation of why my connection is being dropped even though I'm using ssl on the https port (aka how can they tell its a vpn and dropping it when no one else can).

In this case the client was an android which I also use in tandem with my laptop (both connected to the vpn) to test the webpages on a real mobile device instead of an emulated one.

This is the OpenVPN log file:
Event: WAIT
Connecting to mydomain.com:443 (myipaddress) via TCPv4
TCP recv EOF
Transport Error: Transport error on 'mydomain.com: NETWORK_EOF_ERROR
EVENT: TRANSPORT_ERROR info='Transport Error on 'mydomain.com: NETWORK_EOF_ERROR'
EVENT: CONNECTION_TIMEOUT
EVENT: DISCONNECTED
EVENT: CORE_THREAD_INACTIVE
Tunnel bytes per CPU second: 0
-----OpenVPN Stop-----

This was the actual error thrown in the android gui:
Unknown OpenVPN event occurred : Transport error on 'mydomain.com: NETWORK_EOF_ERROR

Any details about this error is greatly appreciated!!!

(I did research this error on the google but couldn't find a person in the same boat that I am in)

Pippin

how can they tell its a vpn and dropping it when no one else can

They probably use DPI firewall.
You could try port 53 or,
activate hotspot on Android, connect laptop to hotspot and start OpenVPN on laptop.
WiFi must be deactivated and 3/4G data enabled.