Monthly Archives: October 2010

BBox2 Sagem Blocked – NAT out failed First packet in connection is not a SYN packet

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Sometimes a Belgacom Modem Sagem 3464 ( BBox 2 ) may block all outgoing traffic on any port except for port 80. You’ll get all sorts of errors from VPN clients, Bittorrent clients, and non port 80 wibsites. Typicaly the errors complain about being unable to connect. Also, the router will block all NAT and Server incomming traffic as well.

In the security log ( firewal -> security log ) you’ll find entries like these:

According to many internet forum posts this can only be solved by rebooting the modem, but there is another, quicker and better solution, especially when you don’t want to reboot the modem.

To quickly resolve this issue without rebooting ( thus without disrupting services like streams, uploads, etc. too long — rebooting takes minutes, while this solution takes less then a second) telnet to the Sagem modem, enter username: admin and password: BGCVDSL2
at the command prompt type:

fw_restart

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Close the telnet session. You’ll now be able to connect to other ports and NAT functionality will be restored.

There is no permanent fix.

Bad Behavior has blocked 1242 access attempts in the last 7 days.