pptpsetup meet error: "EAP: unknown authentication type 26; Naking"

Question

The OS is ubuntu 12.04-lts, when using pptpsetup to setup and initiate a VPN connection, it reports:


    $sudo pptpsetup --create vpn --server xxx.xxx.xxx.xxx --username xxx --password xxx --encrypt --start
    Connect: ppp0  /dev/pts/1
    EAP: unknown authentication type 26; Naking
    EAP: peer reports authentication failure
    Connection terminated.

Here is my /etc/ppp/options.pptp file:


    # Lock the port
    lock

    # Authentication
    # We don't need the tunnel server to authenticate itself
    noauth

    # We won't do PAP, EAP, CHAP, or MSCHAP, but we will accept MSCHAP-V2
    # (you may need to remove these refusals if the server is not using MPPE)
    refuse-pap
    refuse-eap
    refuse-chap
    refuse-mschap
    require-mppe-128

    # Compression
    # Turn off compression protocols we know won't be used
    nobsdcomp
    nodeflate

Andre Figueiredo · Answer 1 · 2017-03-21T13:40:28.443

19

I had same problem and tried a lot of combinations of authentication modes to connect to Windows host.

I solved leaving only MSCHAPv2 selected in GUI interface.

edited Mar 21 '17 at 13:40

answered Sep 25 '16 at 14:15

Andre Figueiredo

12,930
8
48
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Same happened to me in Ubuntu 18.04. This solution worked! – jobima Jul 26 '19 at 12:58
I also need to use this: https://forums.linuxmint.com/viewtopic.php?t=24633 and https://ubuntuforums.org/showthread.php?t=1095546 – Evandro Coan Mar 10 '21 at 15:54

score 7 · Answer 2 · answered Apr 09 '15 at 15:41

I had the same problem (Mint 17) and found this question along with a bunch of tutorials, instructions, etc.

In my case, it turned out to be a missing entry in my peers file. Looking at your commands, I'm guessing that would be /etc/ppp/peers/vpn and the entry is: file /etc/ppp/options.pptp

Here is mine (I've changed the host, username, and tunnel name):

# written by pptpsetup
pty "pptp vpn.foo.com --nolaunchpppd"
lock
noauth
nobsdcomp
nodeflate
name USERNAME
remotename vpn
file /etc/ppp/options.pptp
ipparam vpn
require-mppe-128

Without that file entry I would get the same auth failure error message you reported.

score 3 · Answer 3 · edited Apr 13 '17 at 12:22

I was experiencing this same issue on Ubuntu 15.04. I had followed the instructions given in this answer, but the VPN connection wouldn't work and gave me the error EAP: peer reports authentication failure until I opened /etc/ppp/options.pptp and commented out the lines refuse-chap and refuse-mschap:

# We won't do PAP, EAP, CHAP, or MSCHAP, but we will accept MSCHAP-V2
# (you may need to remove these refusals if the server is not using MPPE)
refuse-pap
refuse-eap
# refuse-chap
# refuse-mschap

score 1 · Answer 4 · answered Nov 25 '16 at 09:48

1

I solved it by following this guide. Enable MPPT, which leaves only MSCHAP and MSCHAPv2. It didn't matter whether I enabled any one of them or both. Enabling MPPT did the trick.

answered Nov 25 '16 at 09:48

Jonas Lindeløv

5,442
6
31
54

score 1 · Answer 5 · answered Jan 04 '23 at 23:33

1

I solved it by using the method recommended by Andre. Im using EndevourOS and this solved SSTP VPN problems involving my workplace.

answered Jan 04 '23 at 23:33

Cem Coral

11
1

pptpsetup meet error: "EAP: unknown authentication type 26; Naking"

5 Answers5