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The_Great_Sephiroth
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Joined: 03 Oct 2014
Posts: 1342
Location: Fayetteville, NC, USA

PostPosted: Sat Oct 17, 2015 3:49 pm    Post subject: PPTP and short reads... Reply with quote

I do not know what is going on, but the past week I have had one heck of a time keeping my PPTP VPN connections working. They connect and within ten seconds drop with a short read error. Now, if I connect and instantly SSH into a box on the remote end, it stays up. After disconnecting the SSH connection, the tunnel dies. This just started and has me baffled. Nothing changed on the remote ends. I am assuming an update broke PPTP somehow on my laptop.

Log:
Code:

Oct 17 11:44:29 laptop01 pptp[5545]: nm-pptp-service-5542 warn[decaps_gre:pptp_gre.c:347]: short read (-1): Message too long
Oct 17 11:44:29 laptop01 pptp[5555]: nm-pptp-service-5542 log[callmgr_main:pptp_callmgr.c:245]: Closing connection (unhandled)
Oct 17 11:44:29 laptop01 pptp[5555]: nm-pptp-service-5542 log[ctrlp_rep:pptp_ctrl.c:258]: Sent control packet type is 12 'Call-Clear-Request'
Oct 17 11:44:29 laptop01 pptp[5555]: nm-pptp-service-5542 log[call_callback:pptp_callmgr.c:84]: Closing connection (call state)

Firewall:
Code:

~ $ sudo iptables -S
Password:
-P INPUT DROP
-P FORWARD DROP
-P OUTPUT ACCEPT
-A INPUT -p tcp -m tcp --dport 22 -m state --state NEW -m recent --set --name BLOCKED --mask 255.255.255.255 --rsource
-A INPUT -p tcp -m tcp --dport 22 -m state --state NEW -m recent --update --seconds 60 --hitcount 4 --name BLOCKED --mask 255.255.255.255 --rsource -j DROP
-A INPUT -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
-A INPUT -p icmp -m icmp --icmp-type 3 -j ACCEPT
-A INPUT -p icmp -m icmp --icmp-type 11 -j ACCEPT
-A INPUT -p icmp -m icmp --icmp-type 12 -j ACCEPT
-A INPUT -p tcp -m tcp --dport 113 --tcp-flags FIN,SYN,RST,ACK SYN -j REJECT --reject-with tcp-reset
-A INPUT -p gre -j ACCEPT
-A INPUT -p tcp -m state --state NEW -m multiport --dports 22,135,139,445,3389 -j ACCEPT
-A INPUT -p udp -m state --state NEW -m multiport --dports 137,138,5060,5353,7078,9078 -j ACCEPT
-A INPUT -i ppp+ -j ACCEPT
-A INPUT -i lo -j ACCEPT

As you can see, GRE is accepted and the firewall has not changed in months. So what is going on here?
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