hey all I am beginner with MikroTik V6.35.4 and Board RB951Ui-2Nd
my problem is
I am using the VPN and it is working with all my devices ( windows 7- Samsung Note 
but now I have Samsung Tab S3 was working good and after I make reset factory for it now It doesn’t work, when I make a connection in my tab, I have in the log in my Win Box
pptp, info . TCP connection established from ... only
can you help me with this problem please
First of all, upgdrade to at least 6.40.8 and change all the passwords you currently use on the router. This will not solve your Samsung problem but will prevent you from getting your router conquered with zero effort by malwares known to date.
Second, stop using PPTP and configure L2TP/IPsec instead. Most clients supporting PPTP support L2TP/IPsec as well and the security is much better.
If that Samsung doesn’t work even with the L2TP/IPsec setup done from scratch, we can debug the connection establishment progress and find what is wrong.
my made the upgrade to 6.42.6
I change my VPN connection to L2TP/IPSec .
in my computer it is work but in my Samsung Device i have those problem i the Log:
no suitable proposal found
failed to get valid proposal
failed to pre-process ph1 packet
phase 1 negotiation failed
what did I have to do?
thank you I solved my problem
Thank you very much
hi friend i am also facing the same problem can you tell me how to fix the error was not thank you