-----Original Message----- From: centos-bounces@centos.org [mailto:centos-bounces@centos.org] On

Behalf

Of Sorin Srbu Sent: Friday, February 20, 2009 11:36 AM To: 'CentOS mailing list' Subject: [CentOS] Getting "poll: protocol failure in circuit setup" from

rsh

I inherited a cpu-stats script from the previous *nixadmin at our department. This script relies on a rsh-command to get the vmstats from

the

remote machines and then using a perl script to push it to a web server.

Now I've just added a new machine running CentOS 5.2 x64 to the script and

I

get the error message in the subject line; "poll: protocol failure in circuit setup".

Replying on my own post for archival reasons: The error was in /etc/hosts.allow. I forgot to add a line "in.rshd: FQDN" in hosts.allow on the machine I imaged and then used to install to a bunch of other machines. Easy to miss though, there are a dozen or so other lines in there allowing other daemons and stuff.

Fixing that, now "rsh remote-machine vmstat" works as expected.