Hello everybody. Been searching this site and the web because of a problem that I have trying to connect a VPN with android. I cannot seem to find a solution to an apparently simple problem. I'm trying to create a plaintext tunnel between my tablet and my old server running XP professional. I only use local network with no firewall in the middle. My server is at 192.168.1.66 and my android is 192.168.1.90 (all fixed addresses). First i'll post my config files: Server.opvn: [code]proto tcp-server port 12345 dev tun ifconfig 10.4.0.1 10.4.0.2 verb 5 cipher none auth none[/code] client.ovpn: [code]remote 192.168.1.66 dev tun ifconfig 10.4.0.2 10.4.0.1 port 12345 proto tcp-client auth none cipher none verb 5 -----BEGIN CERTIFICATE----- --removed -- -----END CERTIFICATE----- [/code] On the server end I use: [code]OpenVPN 2.3.6 i686-w64-mingw32 [SSL (OpenSSL)] [LZO] [PKCS11] [IPv6] built on Dec 1 2014[/code] And on the tablet i'm using: [code]OpenVPN connect 1.1.15 (build 62) OpenVPN core 3.0.3 android armv7a 32-bit [/code] When I try to connect it gives me the following output: [code]EVENT: RESOLVE Contacting 192.168.1.66:12345 via TCP EVENT: WAIT Connecting to 192.168.1.66:12345 (192.168.1.66) via TCPv4 EVENT: CONNECTING Session invalidated: BUFFER_ERROR [/code] When i try to connect on another windows machine with the same config (without the section) everything works. My tablet is *not rooted*. I need the connection to be plaintext and on TCP. Any help will be greatly appreciated. Sorry for my bad english. csilva

[quote]I'm trying to create a plaintext tunnel between my tablet and my old server running XP professional.[/quote] plaintext is the key word here... [quote]When i try to connect on another windows machine with the same config (without the section) everything works. [/quote] sorry i have to ask this, do you know what the ca is about? Michael.

Hello @maikcat and thank you for your help. I only use the because without it I get the error: [code]OpenVPN core error: PolarSSL: ca certificate is undefined[/code] I already tryied the following directives in the client config: [code]setenv CLIENT_CERT 0 client-cert-not-required[/code] Still no joy :( Again thank you for your time. csilva

Error connectiong on android openVPN connect

csilva1975

Hello everybody.

Been searching this site and the web because of a problem that I have trying to connect a VPN with android. I cannot seem to find a solution to an apparently simple problem.

I'm trying to create a plaintext tunnel between my tablet and my old server running XP professional.
I only use local network with no firewall in the middle.
My server is at 192.168.1.66 and my android is 192.168.1.90 (all fixed addresses).

First i'll post my config files:

Server.opvn:

proto tcp-server
port 12345
dev tun
ifconfig 10.4.0.1 10.4.0.2
verb 5
cipher none
auth none

client.ovpn:

remote 192.168.1.66
dev tun
ifconfig 10.4.0.2 10.4.0.1
port 12345
proto tcp-client
auth none
cipher none
verb 5

<ca>
-----BEGIN CERTIFICATE-----
--removed --
-----END CERTIFICATE-----
</ca>

On the server end I use:

OpenVPN 2.3.6 i686-w64-mingw32 [SSL (OpenSSL)] [LZO] [PKCS11] [IPv6] built on Dec  1 2014

And on the tablet i'm using:

OpenVPN connect 1.1.15 (build 62)
OpenVPN core 3.0.3 android armv7a 32-bit

When I try to connect it gives me the following output:

EVENT: RESOLVE
Contacting 192.168.1.66:12345 via TCP
EVENT: WAIT
Connecting to 192.168.1.66:12345 (192.168.1.66) via TCPv4
EVENT: CONNECTING
Session invalidated: BUFFER_ERROR

When i try to connect on another windows machine with the same config (without the <ca></ca> section) everything works.

My tablet is *not rooted*.

I need the connection to be plaintext and on TCP.

Any help will be greatly appreciated.

Sorry for my bad english.
csilva

maikcat

I'm trying to create a plaintext tunnel between my tablet and my old server running XP professional.

plaintext is the key word here...

When i try to connect on another windows machine with the same config (without the <ca></ca> section) everything works.

sorry i have to ask this,

do you know what the ca is about?

Michael.

csilva1975

Hello @maikcat and thank you for your help.

I only use the <ca></ca> because without it I get the error:

OpenVPN core error: PolarSSL: ca certificate is undefined

I already tryied the following directives in the client config:

setenv CLIENT_CERT 0
client-cert-not-required

Still no joy 🙁

Again thank you for your time.
csilva

csilva1975

Hello.

Managed to get the tunnel working using OpenVPN Client Free for Android.

Thank you @maikcat for your support.

Will now start to work on making openVPN work with Arduino 🙂 (that was the reason I needed an unencrypted tunnel)

csilva1975