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[SOLVED] VPN connectioin error: short read (-1): Message too long
Sat, 03 Jan 2015 09:44:16 +0000

If you encounter the following error during VPN connection: pptp[12549]: nm-pptp-service-12543 warn[decaps_gre:pptp_gre.c:331]: short read (-1): Message too long there's an easy fix. You have to lower your MTU (automatically obtained value was invalid).

First, you have to locate your VPN gateway address in syslog: NetworkManager[11926]: <info> VPN Gateway: X.X.X.X Then, you have to check minimum MTU toward this address: $ traceroute --mtu X.X.X.X traceroute to X.X.X.X (X.X.X.X), 30 hops max, 65000 byte packets 1 ( 4.309 ms F=1380 4.042 ms 2.535 ms 2 * *^C Then you have to change MTU it in your primary connection settings (network manager on Ubuntu below):


That's all!. No more spurious disconnects!

Tags: networking.


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