Hello!

I have PPTP tunnel between two mikrotik routers. Everything worked OK but tunnel suddenly stopped working.

Log from PPTP Server :
TCP connection established from... (repeated +/- every 2 minutes)

Log from PPTP Client:
pptp-out1:initializing...
pptp-out1:connecting... (waiting)
pptp-ou1:terminating...-disconnected


Mikrotik's reboot don't change anything.
Can anybody help me?

First check this.
1. Can the routers ping each other?
2. Do you have firewall rules that block pptp port 1723tcp
3. you can get for logging info by adding pptp log rule. To do this go to system --> logging and click on the +. The click on topic and scroll down until you get pptp. Click ok and now it will show more info about pptp

1) Yes. Routers ping each other.
2) I have firewall machine between Mikrotiks. In iptables I forwading port 1723 etc. (Yesterday everything was OK with tunnel). But I think problem is connected with this machine.
3) I can connect to tunnel (Mikrotik PPTP Server) from local network

Try adding pptp logging. Then you might see what happens on both mikrotiks when the disconnection happens.

Why do you have firewall between routers?

how is the setup? internet---mikrotik---firewall---mikrotik?

What firewall are you using?

I think problem is in "firewall machine".
Now everything is OK, but when I lost internet connection between Mikrotik's tunnel won't start normally.
Thanks for helping me.