https://bugzilla.mindrot.org/show_bug.cgi?id=2143
Bug ID: 2143
Summary: X11 forwarding for ipv4 is broken when ipv6 is
disabled on the loopback interface
Product: Portable OpenSSH
Version: 5.3p1
Hardware: All
OS: Linux
Status: NEW
Severity: minor
Priority: P5
Component: sshd
Assignee: [email protected]
Reporter: [email protected]
I haven't seen this exact bug reported, even on the current version.
If the ipv6 kernel module is loaded, and ipv6 is disabled on the
loopback interface, X forwarding (for ipv4, at least) is broken, unless
AddressFamily is set to "inet".
It seems that sshd will refuse to listen for X connections on ipv4 if
it can't open an ipv6 socket. It listens for ssh connections on ipv4
either way, so this appears to be a bug.
Test by toggling /proc/sys/net/ipv6/conf/lo/disable_ipv6.
I could probably find the problem in the code, as I used to be a fairly
competent c programmer, but I just don't have the time.
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