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Cartman
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Posts: 106
Joined: Wed Jul 23, 2008 6:14 pm

PPtP, Disconnect Reason : nas error

Thu Jul 22, 2021 3:13 pm

Hello world!!!

again I have a strange problem and cannot find any info in www.
I have a MikTik as a VPN gateway in my office, my remote networks
build up a PPtP tunnel for management. Everything worked OK until
the guy who lets me use his network set up a IPSec tunnel between his
endpoints.
Now two of the VPN connection are lost and a third disconnects every
few seconds:
14:01:15 pptp,info TCP connection established from <remote DSL> 
14:01:15 pptp,ppp,info,account <SITE> logged in, 172.18.255.42 from <remote DSL> 
14:01:15 pptp,ppp,info <pptp-<SITE>>: authenticated 
14:01:15 pptp,ppp,info <pptp-<SITE>>: using encoding - MPPE128 stateless 
14:01:15 pptp,ppp,info <pptp-<SITE>>: connected 
14:01:19 pptp,ppp,info <pptp-<SITE>>: terminating... - spurios reauthentication 
14:01:19 pptp,ppp,info,account <SITE> logged out, 0 473 280 10 11 from <remote DSL> 
14:01:19 pptp,ppp,info <pptp-<SITE>>: disconnected 
14:01:20 pptp,info TCP connection established from <remote DSL> 
14:01:21 pptp,ppp,info,account <SITE> logged in, 172.18.255.42 from <remote DSL> 
14:01:21 pptp,ppp,info <pptp-<SITE>>: authenticated 
14:01:21 pptp,ppp,info <pptp-<SITE>>: connected 
14:01:21 pptp,ppp,info <pptp-<SITE>>: using encoding - MPPE128 stateless 
14:01:26 pptp,ppp,info <pptp-<SITE>>: terminating... - spurios reauthentication 
14:01:26 pptp,ppp,info,account <SITE> logged out, 0 492 260 9 9 from <remote DSL> 
14:01:26 pptp,ppp,info <pptp-<SITE>>: disconnected 
14:01:26 pptp,info TCP connection established from <remote DSL> 
14:01:27 pptp,ppp,info,account <SITE> logged in, 172.18.255.42 from <remote DSL> 
14:01:27 pptp,ppp,info <pptp-<SITE>>: authenticated 
14:01:27 pptp,ppp,info <pptp-<SITE>>: connected 
14:01:27 pptp,ppp,info <pptp-<SITE>>: using encoding - MPPE128 stateless 
14:01:38 pptp,ppp,info <pptp-<SITE>>: terminating... - spurios reauthentication 
14:01:38 pptp,ppp,info,account <SITE> logged out, 0 492 402 9 10 from <remote DSL> 
14:01:38 pptp,ppp,info <pptp-<SITE>>: disconnected 
14:01:38 pptp,info TCP connection established from <remote DSL> 
14:01:38 pptp,ppp,info,account <SITE> logged in, 172.18.255.42 from <remote DSL> 
14:01:38 pptp,ppp,info <pptp-<SITE>>: authenticated 
14:01:39 pptp,ppp,info <pptp-<SITE>>: connected 
14:01:39 pptp,ppp,info <pptp-<SITE>>: using encoding - MPPE128 stateless 
14:01:57 pptp,ppp,info <pptp-<SITE>>: terminating... - spurios reauthentication 
14:01:57 pptp,ppp,info,account <SITE> logged out, 0 396 477 9 11 from <remote DSL> 
14:01:57 pptp,ppp,info <pptp-<SITE>>: disconnected
/ppp secret shows :
name="<SITE>" service=pptp caller-id="" password=<password> profile=DMZ-Encryption remote-address=172.18.255.42 routes="" ipv6-routes="" limit-bytes-in=0 limit-bytes-out=0 last-logged-out=jul/22/2021 14:06:26 last-caller-id=<remote DSL> last-disconnect-reason=nas-error 
The only information on nas-error I can find is related to a RADIUS problem. But there is no RADIUS and has never been.
Unfortunately I have no access to the hardware offering the IPSec tunnel, so I have to change my setting to work through it.

Any hints ?

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