[Ubuntu-US-CA] All incoming ports blocked without iptables
tony.baechler at gmail.com
Thu Apr 9 13:26:49 UTC 2015
I'm really stumped here. I've tried everything I can think of but nothing
seems to work. I really need help here! I'm willing to try anything at
I am running Ubuntu 14.04.1 and have recently upgraded to the latest 3.13
kernel with security fixes. I rebooted the server after the kernel upgrade
and now all ports are blocked. I get an immediate "connection refused."
I've completely purged ufw, iptables, fail2ban and the Qemu packages just in
case. I can get to the server with a rescue system and I can boot with KVM.
When I boot this way, everything looks fine and the network seems normal.
I can connect to port 22 on localhost just fine. When I reboot out of the
rescue system, everything is again blocked. It's obviously something with
the network, but I don't know what. Trying a 3.16 kernel made no
difference. My daily cron jobs are running and Postfix is running, but it
isn't getting any incoming mail. I restored my /etc/network/interfaces from
a known good backup. I don't recall adding or changing anything related to
bridges or routing.
What else can I try? I would give more information but I don't know where
else to look. I've removed or purged any recent packages which might have
caused a problem. It was fine until I rebooted, but I really don't know
what changed to cause the breakage. Any thoughts?
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