OPENVPN TLS Error: cannot locate HMAC in incoming packet from

Question

I'm trying to connect my client to my server but I get the error in subject. Googoling a while, I can confirm than TLS option is disabled on server/client

2016-09-18 14:26:23+0100 [-] OVPN 0 OUT: 'Sun Sep 18 13:26:23 2016 TLS Error: cannot locate HMAC in incoming packet from [AF_INET]2.25.60.99:23734'
2016-09-18 14:26:25+0100 [-] OVPN 0 OUT: 'Sun Sep 18 13:26:25 2016 TLS Error: cannot locate HMAC in incoming packet from [AF_INET]2.25.60.99:237

---SERVER--

...
# The second parameter should be '0'
# on the server and '1' on the clients.
;tls-auth ta.key 0 # This file is secret
...

--CLIENT--

...
# then every client must also have the key.
;tls-auth ta.key 1
...

I have tried also to enable the feature and create the key but a that point I get

2016-09-18 11:38:45+0100 [-] OVPN 0 OUT: 'Sun Sep 18 10:38:45 2016
Authenticate/Decrypt packet error: packet HMAC authentication failed'
2016-09-18 11:38:45+0100 [-] OVPN 0 OUT: 'Sun Sep 18 10:38:45 2016 TLS
Error: incoming packet authentication failed from
[AF_INET]2.25.60.99:22932'

Any idea? Thanks!

Answer 1

The problem was that I was running OpenVPN and OpenVPN GUI on the same node. Once disabled OpenVPN GUI I was able to connect my VPN