Repairing the server-side SSTP VPN on the Mikrotik router

A few months ago, we found a problem with one the Mikrotik Routerboard RB1100AH unit. We discovered that the fans are not working. As we have a cold spare unit, I just transferred the latest backup to the new unit.

After the reboot, everything began to work. That was easy on the first sight. However, I discovered soon that the remote offices are not connected to the central location. The VPN links were down.

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How to import certificates into Mikrotik RouterOS

We need certificates for specific VPN technologies, including Microsoft SSTP and OpenVPN tunnels. For small installations, we will use the self-signed CA infrastructure. Moreover, this process is the same regardless how we obtain those certificates.

The procedure described here is the same for any version of Mikrotik RouterOS, from 3.30 to 6.36.3. We can work from the command line or from WinBox GUI.

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How to repair VPN client connection in Mikrotik RouterOS

I made a VPN star-based network between my home router and few others, that I configured over a time. This network is here just for quick monitoring of state for a distant routers. Also, good basis for real-life learning, as all those routers are alive.

If a router is not connected over a VPN, this is a signal that something bad happens there. Also, on some routers, their source IP address in a VPN connection can indicate that they are swapped to the secondary link. Again, we have alarm that something is wrong.

I checking them from time to time, as I don’t need to administer them on daily basis. I spotted recently that one of a distant Mikrotik Routerboards (http://routerboard.com/) is not connected over the VPN connection to my router.

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