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Date:      Fri, 26 Mar 2010 08:53:08 +0200
From:      "Tongai. T Zimbiti" <tongai@yoafrica.com>
To:        freebsd-questions@freebsd.org
Subject:   ipfw and ssh problem
Message-ID:  <4BAC59D4.8050605@yoafrica.com>

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Hi guys,

I have searched everywhere and failed to find a solution, hence I write you.
I have installed 8.0-RELEASE FreeBSD 8.0-RELEASE #0: Sat Nov 21 15:02:08 
UTC 2009     root@mason.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC  amd64
together with ipfw. The problem I have is this, if I am on the box I can 
restart my firewall with no problem, but when I log in remotely and 
restart the firewall for reason I am locked out and can not ssh into it.

Below is the messages log:
Mar 25 14:51:04 panadine kernel: Trying to mount root from ufs:/dev/ad4s1a
Mar 25 14:51:04 panadine kernel: ipfw2 (+ipv6) initialized, divert 
loadable, nat loadable, rule-based forwarding disabled, default to deny, 
logging disabled
Mar 25 14:51:06 panadine kernel: ae0: link state changed to UP
Mar 25 14:51:16 panadine ntpd[645]: ntpd 4.2.4p5-a (1)
Mar 25 14:51:17 panadine nrpe[698]: Starting up daemon
Mar 25 14:51:25 panadine ntpd[646]: kernel time sync status change 2001
Mar 25 14:51:32 panadine su: systz to root on /dev/pts/0
Mar 25 15:01:46 panadine kernel: ifa_del_loopback_route: deletion failed
Mar 25 15:01:46 panadine kernel: ae0: link state changed to DOWN
Mar 25 15:01:47 panadine sshd[829]: fatal: Write failed: Permission denied
Mar 25 15:01:48 panadine kernel: ae0: link state changed to UP

Here is a few lines from my /etc/firewall_rules

# vim: set syntax=pf :

-f flush

# Let me talk out
add 100 allow all from me to any out keep-state
add 101 allow icmp from any to any via any
add 102 allow udp from any to any 33434-33523

# Deal with loopback
#add 1000 allow all from any to any via lo0
add 1001 deny ip from any to 127.0.0.0/8
add 1002 deny ip from 127.0.0.0/8 to any

# Allow established and fragmented sessions
add 2000 allow tcp from any to any established
add 2001 allow ip from any to any frag
add 2002 check-state
add 2003 allow icmp from any to any


I have enabled net.inet.ip.fw.verbose=1 in /etc/sysctl.conf

please help


regards


Tongai



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