Peer disconnecting when setting Mikrotik as OpenVPN client - client

Question

I want to connect my OpenVPN server (Ubuntu 16.4) in my office to my Mikrotik at home as client.
I already have OpenVPN server set based on this tutorial (link). If I try to connect it connects with OpenVPN client Windows app (no errors), and asks for username and password, with Client.ovpn added in Program Files/OpenVPN/config.
Here is my server.conf in OpenVPN server:
port 51333
proto tcp
dev tun5
ca ca.crt
cert server.crt
key server.key
dh dh2048.pem
server 10.8.101.0 255.255.255.0
ifconfig-pool-persist ipp.txt
push "route 192.168.20.10 255.255.255.255" #This is my server that I want to connect in Office
keepalive 10 120
tls-auth /etc/openvpn/ta.key
key-direction 0
cipher AES-256-CBC
auth SHA1
max-clients 10
user nobody
group nogroup
persist-key
persist-tun
username-as-common-name
plugin /usr/lib/openvpn/openvpn-plugin-auth-pam.so /etc/pam.d/openvpn
status /etc/openvpn/mikrotik.log
verb 5
mute-replay-warnings
client-config-dir ccd
management localhost 7505
Here is my configuration of base.conf in OpenVPN server (Ubuntu) for creating client.ovpn files:
client
dev tun
proto tcp
remote mydomain.com 51333 #in my DNS I redirect this domain to my public static domain in office there in firewall I am portforwarding this port to my server in office
resolv-retry infinite
nobind
user nobody
group nogroup
auth-user-pass
#ca ca.crt
#cert client.crt
#key client.key
remote-cert-tls server
tls-auth ta.key
cipher AES-256-CBC
auth SHA1
# More reliable detection when a system loses its connection.
ping 15
ping-restart 45
ping-timer-rem
persist-tun
persist-key
verb 5
key-direction 1
Now in Mikrotik (OS is: v6.42.12 in hAP lite (simps) I have:
Import my Client.ovpn in Files
Import Certificate Client.ovpn and set for T (name: ca.crt_0) and for KT (name: client.crt_0).
Create new PPP Profile: ppp profile add name=OVPN-client change-tcp-mss=yes only-one=yes use-encryption=required use-mpls=no
Create new interface: interface ovpn-client add connect-to=mydomain.com port 51333 add-default-route=no auth=sha1 certificate=client.crt_0 disabled=no user=vpnuser password=vpnpass name=myvpn profile=OVPN-client
But with this configuration, I cannot establish a connection. I cannot get "R - status" on OVPN-client, I only get this error:
* ovpn-out1: connecting
* ovpn-out1: terminating - peer disconnected
* ovpn-out1: disconnected
If I check logs in server I get this:
openVPN1 ovpn-server[2050]: MULTI: multi_create_instance called
Oct 26 09:33:03 openVPN1 ovpn-server[2050]: Re-using SSL/TLS context
Oct 26 09:33:03 openVPN1 ovpn-server[2050]: Control Channel MTU parms
Oct 26 09:33:03 openVPN1 ovpn-server[2050]: Data Channel MTU parms
Oct 26 09:33:03 openVPN1 ovpn-server[2050]: Local Options String: 'V4,dev-type tun,link-mtu 1559,tun-mtu 1500,proto TCPv4_SERVER,keydir 0,cipher AES-256-CBC,auth SHA1,keysize 256,tls-auth,key-method 2,tls-server'
Oct 26 09:33:03 openVPN1 ovpn-server[2050]: Expected Remote Options String: 'V4,dev-type tun,link-mtu 1559,tun-mtu 1500,proto TCPv4_CLIENT,keydir 1,cipher AES-256-CBC,auth SHA1,keysize 256,tls-auth,key-method 2,tls-client'
Oct 26 09:33:03 openVPN1 ovpn-server[2050]: Local Options hash (VER=V4): '7ac8f09f'
Oct 26 09:33:03 openVPN1 ovpn-server[2050]: Expected Remote Options hash (VER=V4): '53276059'
Oct 26 09:33:03 openVPN1 ovpn-server[2050]: TCP connection established with [AF_INET]XX.XXX.XXX.XX:60345
Oct 26 09:33:03 openVPN1 ovpn-server[2050]: TCPv4_SERVER link local: [undef]
Oct 26 09:33:03 openVPN1 ovpn-server[2050]: TCPv4_SERVER link remote: [AF_INET]XX.XXX.XXX.XX:60345
Oct 26 09:33:03 openVPN1 ovpn-server[2050]: XX.XXX.XXX.XX:60345 TLS: Initial packet from [AF_INET]XX.XXX.XXX.XX:60345
Oct 26 09:33:03 openVPN1 ovpn-server[2050]: XX.XXX.XXX.XX:60345 TLS Error: cannot locate HMAC in incoming packet from [AF_INET]XX.XXX.XXX.XX:60345
Oct 26 09:33:03 openVPN1 ovpn-server[2050]: XX.XXX.XXX.XX:60345 Fatal TLS error (check_tls_errors_co), restarting
Oct 26 09:33:03 openVPN1 ovpn-server[2050]: XX.XXX.XXX.XX:60345 SIGUSR1[soft,tls-error] received, client-instance restarting
Oct 26 09:33:03 openVPN1 ovpn-server[2050]: TCP/UDP: Closing socket

Answer 1

MikroTik does not support UDP in OpenVPN only TCP.
ROS 7 will support it but it's still in development phase.

Answer 2

As of 2022 - you would need to use ROS version 7 or later, where UPP support for OpenVPN is implemented. Still, Mikrotik's implementation of OpenVPN is limited, eg. no support for TLS auth with a static key.