OpenVPN not connecting using Asus RT-AC51U as Client

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blessing
DD-WRT Novice


Joined: 13 Sep 2021
Posts: 1

PostPosted: Mon Sep 13, 2021 7:26    Post subject: OpenVPN not connecting using Asus RT-AC51U as Client Reply with quote
Hi Guys,
I'm asking for your assistance please. I'm using a Asus Router RT-AC51U as a client connecting to my OpenVPN Server (Untangle_OpenVPN).
I can confirm that the server is working because I've tested the same cert using the OpenVPN Connect application and that connects with no issues.

However when i use the same cert on the router "client" I get the following error:

rc_service: httpds 213:notify_rc restart_vpncall
vpnclient5[23924]: Options error: Unrecognized option or missing parameter(s) in config.ovpn:37: compress (2.3.2)
vpnclient5[23924]: Use --help for more information.


Please see my client config below...
client
resolv-retry 20
keepalive 2 10
nobind
mute-replay-warnings
remote-cert-tls server
compress
verb 1
persist-key
persist-tun
explicit-exit-notify 1
dev tun
proto udp
port 1194
cipher AES-128-CBC
remote x.x.x.x 1194 # public address

<ca>
-----BEGIN CERTIFICATE-----

-----END CERTIFICATE-----
</ca>

<cert>
-----BEGIN CERTIFICATE-----

-----END CERTIFICATE-----
</cert>

<key>
-----BEGIN PRIVATE KEY-----

-----END PRIVATE KEY-----
</key>
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egc
DD-WRT Guru


Joined: 18 Mar 2014
Posts: 12917
Location: Netherlands

PostPosted: Mon Sep 13, 2021 7:35    Post subject: Reply with quote
What build are you using?

Some general instructions see the openvpn documentation, link in my signature

Furthermore for some useful tips see the forum guidelines link also in my signature

_________________
Routers:Netgear R7000, R6400v1, R6400v2, EA6900 (XvortexCFE), E2000, E1200v1, WRT54GS v1.
Install guide R6400v2, R6700v3,XR300:https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=316399
Install guide R7800/XR500: https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=320614
Forum Guide Lines (important read):https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=324087
d33b0_n4p41m
DD-WRT User


Joined: 10 Sep 2021
Posts: 133

PostPosted: Mon Sep 13, 2021 11:55    Post subject: Reply with quote
It does not appear that the RT-AC51U is even currently officially supported by DD-WRT:

https://forum.dd-wrt.com/wiki/index.php/Supported_devices#Asus

https://download1.dd-wrt.com/dd-wrtv2/downloads/betas/2021/09-08-2021-r47381/

https://forum.dd-wrt.com/phpBB2/viewtopic.php?p=1063483

https://forum.dd-wrt.com/phpBB2/viewtopic.php?p=1059659

https://wikidevi.wi-cat.ru/ASUS_RT-AC51U

If you are asking for support for using another 3rd-party firmware, that may not work out for you. The only 3rd-party firmware currently known for this device is Padavan, which does not seem to have been updated in at least two years by any official or forked version:

https://www.google.com/search?q=padavan+firmware+github

Such an older OpenVPN client may not work; or rather, may not be very secure ^_^
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