i'm toying with the idea of moving from cisco to MT.
i have an MT-in-vm setup.
i'd like to use MT to serve as openVPN server.
my problem is, i can't connect windows openVPN connect (v 2.1.3.111) to the openvpn server.

here's the client log:
Wed Jul 18 15:27:02 2018 Wed Jul 18 15:27:02 2018 OpenVPN Management Interface 1.0.0/3.1.1 win x86_64 64-bit [PolarSSL] built on Sep 29 2016 14:26:53
Wed Jul 18 15:27:02 2018 Wed Jul 18 15:27:02 2018 OMI Connecting to [127.0.0.1]:57006 [tcp]
Wed Jul 18 15:27:04 2018 Wed Jul 18 15:27:04 2018 Frame=512/2048/512 mssfix-ctrl=1250
Wed Jul 18 15:27:04 2018 Wed Jul 18 15:27:04 2018 RESOLVE
Wed Jul 18 15:27:04 2018 Wed Jul 18 15:27:04 2018 Contacting x.x.x.x:1194 via TCP
Wed Jul 18 15:27:04 2018 Wed Jul 18 15:27:04 2018 WAIT
Wed Jul 18 15:27:04 2018 Wed Jul 18 15:27:04 2018 Connecting to [x.x.x.x]:1194 (x.x.x.x) via TCPv4
Wed Jul 18 15:27:04 2018 Wed Jul 18 15:27:04 2018 CONNECTING
Wed Jul 18 15:27:04 2018 Wed Jul 18 15:27:04 2018 Tunnel Options:V4,dev-type tun,link-mtu 1543,tun-mtu 1500,proto TCPv4_CLIENT,cipher BF-CBC,auth SHA1,keysize 128,key-method 2,tls-client
Wed Jul 18 15:27:04 2018 Wed Jul 18 15:27:04 2018 Creds: Username/Password
Wed Jul 18 15:27:04 2018 Wed Jul 18 15:27:04 2018 Peer Info:
IV_GUI_VER=ovpnmi 1.0.0
IV_VER=3.1.1
IV_PLAT=win
IV_NCP=2
IV_TCPNL=1
IV_PROTO=2
UV_ASCLI_VER=UV_ASCLI_VER
UV_PLAT_REL=UV_PLAT_REL
IV_BS64DL=1

Wed Jul 18 15:27:04 2018 Wed Jul 18 15:27:04 2018 VERIFY OK: depth=1
cert. version : 3
serial number : 43:4E:A2:2D:45:DF:55:46
issuer name : CN=myCa
subject name : CN=myCa
issued on : 2018-07-12 17:52:07
expires on : 2019-07-12 17:52:07
signed using : RSA with SHA-256
RSA key size : 2048 bits
basic constraints : CA=true
key usage : Key Cert Sign, CRL Sign

Wed Jul 18 15:27:04 2018 Wed Jul 18 15:27:04 2018 VERIFY OK: depth=0
cert. version : 3
serial number : 60:54:4D:09:03:08:51:69
issuer name : CN=myCa
subject name : CN=server
issued on : 2018-07-12 17:52:23
expires on : 2019-07-12 17:52:23
signed using : RSA with SHA-256
RSA key size : 2048 bits
basic constraints : CA=true
key usage : Digital Signature, Key Encipherment, Data Encipherment, Key Cert Sign, CRL Sign
ext key usage : TLS Web Server Authentication, TLS Web Client Authentication

Wed Jul 18 15:27:05 2018 Wed Jul 18 15:27:05 2018 TCP recv EOF
Wed Jul 18 15:27:05 2018 Wed Jul 18 15:27:05 2018 Transport Error: Transport error on 'x.x.x.x: NETWORK_EOF_ERROR
Wed Jul 18 15:27:05 2018 Wed Jul 18 15:27:05 2018 TRANSPORT_ERROR : Transport error on 'x.x.x.x: NETWORK_EOF_ERROR [ERR]
Wed Jul 18 15:27:05 2018 Wed Jul 18 15:27:05 2018 Client terminated, restarting in 5...

From the server, it look like the client gave up.

i've tried using self-signed self created cert (and importing the ca into my windows machine), and i've tried using my godaddy domain cert (still kindda gray for me as go daddy ca is 3 levels deep).

also, i managed to connect using android openvpn, but not windows openvpn connect... (i've tried multiple different machines with different openvpn client version)

has anybody done it? any pointer?

OpenVPN is quite lacking in RouterOS. There are many who are asking for better support. For now I would stick with your Cisco deployment if it is working for you.