Why is L2TP VPN regularly reconnecting?

Question

VPN

Good afternoon.
I configured L2TP + ipsec VPN on my VPN for use on MicroTik. Everything seems to work well, but the log shows regular reconnections with an equal interval of 30 or 60 minutes. What can be wrong?

I made the settings according to this guide: https://itcrowd.top/l2tpipsec
I would like to note that I use another VPN of the same type from one service, there is no such problem with it.

Answer 1

I will assume that traffic does not go in your tunnel, timeout is triggered and the connection is disconnected. The only question is from which side, server or piece of iron. Here it is already necessary to smoke logs