Vpn connection breaks with hint "short read (-1): Message too long"

I have duall access l2tp connection to internet through router and pptp connection to my company's local network. Network Manager connects succesfully to vpn, but when I try to get some resources from company's network(for examle, clone git repository or connect to jira's dashboard), vpn connection breaks up with message(from syslog):
short read (-1): Message too long
whereas connection to moinmoin wiki causing no errors.
Ubuntu version: 12.10

1 Answer

Usually this issue happens because of high MTU(Maximum Transmission Unit) value. So the fix is to Change the MTU value in the NetworkManager.

Open System Settings -> Network

Under "Wired" select options and change the MTU to some lower value

Alternate way to change this settings is by editing the /etc/network/interfaces and add the line MTU value.

mtu some_value_here

Now restart the networking /etc/init.d/networking restart

To check the current MTU value use the command /sbin/ifconfig and look MTU in eth0