Since routers v 6.7 is not possible to connect from IOS to mikrotik openvpn, “disconnected ” error.
It is possible to connect from viscosity (osx) and linux terminal.
I have tested some latest versions of routers (IOS to mikrotik):
6.7 working
6.9 no
6.10 no
6.11 no
6.12 no
6.13 no
6.14 no
6.15 no.
I tried to use some different chippers, but no success.
What was changed since 6.7 version?
I found solution and now iOS openvpn client v. (1.0.4 build 140) connects to mikrotik routeros v 6.18.
IOS settings->openvpn->advanced settings->Force AES-CBC ciphersuites (disabled this option).