SSTP connection droping

[mrakar]

I have installed latest softether server on linux machine in AWS.

My management tools connect correctly and I can also connect with my client to it correctly (NAT and DHCP are used).
If I connect with softether client it works to the best of my knowledge ok.
If I try to use SSTP client on my Mikrotik router, whenever some significant traffic starts flowing connection drops and reestablishes and drops again and so on.

In my log file I have following:

2015-03-27 15:42:48.425 SSTP PPP Session [9xxxxxxx:33896]: The PPP session is disconnected because the upper-layer protocol "SSTP" has been disconnected.
2015-03-27 15:42:48.425 SSTP PPP Session [9xxxxxxx::33896]: The PPP session is disconnected.
2015-03-27 15:42:48.657 SSTP PPP Session [9xxxxxxx::33897]: A new PPP session (Upper protocol: SSTP) is started. IP Address of PPP Client: 94.xxxx (Hostname: "cpe-9xxxxxxx:"), Port Number of PPP Client: 33897, IP Address of PPP Server: 10.170.90.141, Port Number of PPP Server: 443, Client Software Name: "Microsoft SSTP VPN Client", IPv4 TCP MSS (Max Segment Size): 0 bytes
2015-03-27 15:42:48.748 Connection "CID-102" terminated by the cause "Connection has been disconnected." (code 3).
2015-03-27 15:42:48.748 Connection "CID-102" has been terminated.
2015-03-27 15:42:48.748 The connection with the client (IP address 94.2xxxxxx, Port number 33896) has been disconnected.
2015-03-27 15:42:48.980 [HUB "DEFAULT"] Session "SID-TEST-[SSTP]-31": The session has been terminated. The statistical information is as follows: Total outgoing data size: 146688 bytes, Total incoming data size: 4529 bytes.
2015-03-27 15:42:49.000 Connection "CID-103" terminated by the cause "The VPN session has been deleted. It is possible that either the administrator disconnected the session or the connection from the client to the VPN Server has been disconnected." (code 11).
2015-03-27 15:42:49.000 Connection "CID-103" has been terminated.
2015-03-27 15:42:49.000 The connection with the client (IP address 94.xxxxxxxxxxxxx, Port number 33896) has been disconnected.

This is all I see in my log file as far as disconnection goes, then, a couple if miliseconds later I see that link has been established again.

2015-03-27 15:42:49.132 On the TCP Listener (Port 0), a Client (IP address 94xxxxxxxxxxxxxx, Host name "cpe-9xxxxxxxxxxxxxxxxxxxxxxx", Port number 33897) has connected.

---

Now, my question is where to look for in order to find error or misconfiguration? Mikrotik connect ok with other SSTP (non sofether) servers, and my softether client works ok with the server.

[thisjun]

Is there any log in client side?

If you want to know about traffic, try to turn on Ethernet packet log option in SoftEther VPN server.

[mrakar]

thisjun wrote:
> Is there any log in client side?
>
> If you want to know about traffic, try to turn on Ethernet packet log
> option in SoftEther VPN server.

No, on my client side is Mikrotik router (which work nicely with some other SSTP VPN providers, so I ruled out my client as a source of the problem - but again, softether vpn client works ok and stable as well).

Also, I have moved to l2tp protocol (on the very same router) and it works nicely and stable so I guess I can be pretty sure that SSTP on server side is a cause of the problem.

[Chumayu]

Hello,

i have some problem

I using mikrotik router and connect to my softether VPN, if i not load channel, tunnel can work 3-5 hours.
But if i some load channel (open 1-2 youtube video) connection dropped

In attachment you can find log from mikrotik.

[thisjun]

In this log, there isn't any log about reason of disconnect.
Do you have any other log?

[thisjun]

Please try downgrade mikrotik .
http://forum.mikrotik.com/viewtopic.php?t=83625