> So, you don't see ::1/128 on your loopback interface?
> Did you modify the system (before the upgrade) in an attempt to disable 
> IPv6?  If so, you'll need to undo that.

Thanks, that seems to be it. Back in the F20 days, ipv6 was causing me a huge 
amount of trouble with DNS lookups timing out, etc.  I'd completely forgotten 
that I'd disabled it, by adding a file /etc/sysctl.d/98-noipv6.conf with the 
contents:

net.ipv6.conf.all.disable_ipv6=1
net.ipv6.conf.default.disable_ipv6=1

That solved the problems I had back then. I just manually changed those sysctl 
variables back to 0, and ssh X forwarding now works.

Ideally I'd prefer to keep ipv6 disabled for now, and convince sshd to use ipv4 
for the forwarding, but if I run with ipv6 enabled for a while and it doesn't 
cause me any issues, I'll leave it on.

My ISP does offer ipv6, but when I tried it back then, I had a lot of trouble 
with it. Maybe I should try again now.

Thanks!
Eric
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