Hi, I’m with the same problem as you.
I cannot access the VPN from a user with Windows or Linux.
All users connected remotely from Windows or Linux, but now I can only connect from android.
I have a point-to-point VPN with another mikrotik and that one has had no problems.
He tried what they put in the forum but without results.
This is mi log error
oct/02 22:07:34 ipsec,info respond new phase 1 (Identity Protection): 190.64.xxx.***
4[500]<=>216.218.xxx.[21347]
oct/02 22:07:34 ipsec,error 216.218.xxx.failed to get valid proposal.
oct/02 22:07:34 ipsec,error 216.218.xxx. failed to pre-process ph1 packet (side
: 1, status 1).
oct/02 22:07:34 ipsec,error 216.218.xxx. phase1 negotiation failed.