VPN disconnecting problem

Hi,
I’ve made PPTP VPN server on my Mikrotik. I use it to get to my local network from outside.

The first client connects to the server without problems. Following clients are disconnected after 16 minutes.

Have you ever solved anything like that?

Board Name: RB750GL
Current Firmware: 3.10
Version: 6.7

Log is here:

 	 	#	Time	Buffer	Topics	Message	 
941	Jan/07/2014 12:36:29	disk	pptp, ppp, debug	<81.200.51.146>: LCP lowerdown	
942	Jan/07/2014 12:36:29	disk	pptp, ppp, debug	<81.200.51.146>: LCP closed	
943	Jan/07/2014 12:36:29	disk	pptp, ppp, debug	<81.200.51.146>: CCP lowerdown	
944	Jan/07/2014 12:36:29	disk	pptp, ppp, debug	<81.200.51.146>: CCP closed	
945	Jan/07/2014 12:36:29	disk	pptp, ppp, debug	<81.200.51.146>: BCP lowerdown	
946	Jan/07/2014 12:36:29	disk	pptp, ppp, debug	<81.200.51.146>: BCP down event in starting state	
947	Jan/07/2014 12:36:29	disk	pptp, ppp, debug	<81.200.51.146>: IPCP lowerdown	
948	Jan/07/2014 12:36:29	disk	pptp, ppp, debug	<81.200.51.146>: IPCP closed	
949	Jan/07/2014 12:36:29	disk	pptp, ppp, info, account	vpn1 logged out, 965 164645 1714332 1759 1915	
950	Jan/07/2014 12:36:29	disk	pptp, ppp, debug	<81.200.51.146>: IPV6CP lowerdown	
951	Jan/07/2014 12:36:29	disk	pptp, ppp, debug	<81.200.51.146>: IPV6CP down event in starting state	
952	Jan/07/2014 12:36:29	disk	pptp, ppp, debug	<81.200.51.146>: MPLSCP lowerdown	
953	Jan/07/2014 12:36:29	disk	pptp, ppp, info	<pptp-vpn1>: terminating... - disconnected	
954	Jan/07/2014 12:36:29	disk	pptp, ppp, debug	<81.200.51.146>: LCP lowerdown	
955	Jan/07/2014 12:36:29	disk	pptp, ppp, debug	<81.200.51.146>: LCP down event in starting state	
956	Jan/07/2014 12:36:29	disk	route, debug, event	Interface change	
957	Jan/07/2014 12:36:29	disk	route, debug, event	 interface=<pptp-vpn1>	
958	Jan/07/2014 12:36:29	disk	route, debug, event	 status=DOWN	
959	Jan/07/2014 12:36:29	disk	route, debug, event	 mtu=1450	
960	Jan/07/2014 12:36:29	disk	route, debug, event	Interface change	
961	Jan/07/2014 12:36:29	disk	route, debug, event	 interface=<pptp-vpn1>	
962	Jan/07/2014 12:36:29	disk	pptp, ppp, info	<pptp-vpn1>: disconnected	
963	Jan/07/2014 12:36:29	disk	route, debug, event	 status=DOWN	
964	Jan/07/2014 12:36:29	disk	route, debug, event	 mtu=1450	
965	Jan/07/2014 12:36:29	disk	route, debug, event	Remove interface <pptp-vpn1>	
966	Jan/07/2014 12:36:29	disk	route, debug, event	Interface change	
967	Jan/07/2014 12:36:29	disk	route, debug, event	 interface=<pptp-vpn1>	
968	Jan/07/2014 12:36:29	disk	route, debug, event	 status=DOWN	
969	Jan/07/2014 12:36:29	disk	route, debug, event	 mtu=1450	
970	Jan/07/2014 12:36:29	disk	route, debug, event	Interface change	
971	Jan/07/2014 12:36:29	disk	route, debug, event	 interface=<pptp-vpn1>	
972	Jan/07/2014 12:36:29	disk	route, debug, event	 status=DOWN	
973	Jan/07/2014 12:36:29	disk	route, debug, event	 mtu=1450	
974	Jan/07/2014 12:36:29	disk	route, debug, event	Remove interface <pptp-vpn1>	
975	Jan/07/2014 12:36:29	disk	route, debug, calc	Begin calculation	
976	Jan/07/2014 12:36:29	disk	route, debug, event	Removed route	
977	Jan/07/2014 12:36:29	disk	route, debug, event	 state=ACTIVE	
978	Jan/07/2014 12:36:29	disk	route, debug, event	 dst-prefix=10.0.0.61/32	
979	Jan/07/2014 12:36:29	disk	route, debug, event	 attributes	
980	Jan/07/2014 12:36:29	disk	route, debug, event	 protocol=CONNECT	
981	Jan/07/2014 12:36:29	disk	route, debug, event	 distance=0	
982	Jan/07/2014 12:36:29	disk	route, debug, event	 scope=10	
983	Jan/07/2014 12:36:29	disk	route, debug, event	 target-scope=0	
984	Jan/07/2014 12:36:29	disk	route, debug, event	 connected-net= address=10.0.0.3/32 interface=<pptp-vpn1>	
985	Jan/07/2014 12:36:29	disk	route, debug, event	 routing-mark=main	
986	Jan/07/2014 12:36:29	disk	route, debug, event	 table=main	
987	Jan/07/2014 12:36:29	disk	route, debug, event	 origin-type=CONNECTED	
988	Jan/07/2014 12:36:29	disk	route, debug, calc	End calculation	
989	Jan/07/2014 12:36:29	disk	route, debug	Begin redistribution	
990	Jan/07/2014 12:36:29	disk	route, debug	Accept withdraw 10.0.0.61/32	
991	Jan/07/2014 12:36:29	disk	route, debug	Commit prefix 10.0.0.61/32	
992	Jan/07/2014 12:36:29	disk	route, debug	End redistribution	
993	Jan/07/2014 12:36:29	disk	ipsec, debug	This product is linked with OpenSSL	
994	Jan/07/2014 12:36:29	disk	ipsec, debug	10.0.0.3[500] used as isakmp port (fd=18)	
995	Jan/07/2014 12:36:29	disk	ipsec, debug	10.0.0.3[500] used as isakmp port (fd=19)	
996	Jan/07/2014 12:36:29	disk	route, debug, calc	Begin calculation	
997	Jan/07/2014 12:36:29	disk	route, debug, event	Address removed	
998	Jan/07/2014 12:36:29	disk	route, debug, event	 network=10.0.0.61/32	
999	Jan/07/2014 12:36:29	disk	route, debug, calc	End calculation

No ideas?

Hello,
Did you ever arrive at a solution? i see the same problem, as duplicated by the sequence of first dozen or so messages indicating VPN shutdown, when using SSTP to create a VPN. In my case, both the client and servers are Mikrotik 6.10 systems (951G client and 1100AhX2 server). Did you submit a problem issue to support?