On 11/28/2012 12:45 PM, Johnny Hughes wrote: > On 11/28/2012 12:25 PM, Charles Bearden wrote: >> Hi all, >> >> I'm pretty new to CentOS. I am working with a newly set-up server: >> >> [cbearden at host ~]$ lsb_release -a >> LSB Version: >> :core-4.0-amd64:core-4.0-noarch:graphics-4.0-amd64:graphics-4.0-noarch:printing-4.0-amd64:printing-4.0-noarch >> Distributor ID: CentOS >> Description: CentOS release 6.3 (Final) >> Release: 6.3 >> Codename: Final >> >> I'm trying to solve this problem (X11 forwarding) >> http://thread.gmane.org/gmane.linux.centos.general/119342/focus=119347 >> for myself. >> >> But disabling ipv6 and adding >> >> AddressFamily inet >> >> to my sshd config didn't fix the problem. Oddly enough, the output of >> >> netstat -an >> >> suggests that ipv6 is still enabled: >> >> tcp 0 0 :::22 :::* LISTEN >> >> even though >> >> [cbearden at PostgreSQL ~]$ cat /proc/sys/net/ipv6/conf/all/disable_ipv6 >> 1 >> >> This is after a reboot. Am I right that the /proc file suggests that ipv6 is >> disabled while netstat suggests that it isn't? >> >> Thanks, >> Chuck > > http://wiki.centos.org/FAQ/CentOS6#head-d47139912868bcb9d754441ecb6a8a10d41781df Thanks to Mark, Barry, and Johnny for their swift responses. I tried the steps at the wiki page above, but no joy. In particular, when I restart sshd, it appears that the 'stop' part fails: # /etc/init.d/sshd restart Stopping sshd: [FAILED] Starting sshd: [ OK ] Despite altering both values via sysctl and adding the AddressFamily line and uncommenting ListenAddress 0.0.0.0, sshd appears still to be listening on :::22. Other processes are still listening on ipv6-bound ports as well. Do I need to explicitly remove the ipv6 kernel module? I probably can't while some daemons are bound to ::: ports. Sorry if I'm being dense here. I don't know if this makes any difference, but the CentOS system is running in a VM. It's not a setup I chose or ultimately control. Thanks, Chuck -- Chuck Bearden Programmer Analyst IV The University of Texas Health Science Center at Houston School of Biomedical Informatics Email: Charles.F.Bearden at uth.tmc.edu Phone: 713.500.9672