Yet another NRPE issue...

[Carroll, Jim P [Contractor]]

In your /etc/xinetd.d/nrpe file, what do you have for IP addresses in the
only_from definition?  Does it match the IP address of the host you're
trying to connect from?

Your Nagios host wouldn't happen to be using DHCP, would it?

Food for thought.

jc

> -----Original Message-----
> From: andrew.slater at netstrategy.net
> [mailto:andrew.slater at netstrategy.net]
> Sent: Tuesday, December 03, 2002 12:07 AM
> To: Nagios-users at lists.sourceforge.net
> Subject: [Nagios-users] Yet another NRPE issue...
> 
> 
> Hi all,
> 
> The story goes like this;
> 
> I had my Nagios setup and working beautifully with NRPE 
> working fine on 20
> odd hosts. I went away for a couple of weeks and as the 
> system is somewhat
> developmental at the moment, was happy enough to have it 
> shutdown for the
> time I was away. The problem is that now I am back, the 
> system is plugged
> back in I cant get any response from any server with NRPE on it.
> 
> The details;
> 
> - check_nrpe run on the target machine works fine
> - Nagios called check_nrpe command fails with "CHECK_NRPE: Received 0
> bytes. Are we allowed to connect to the host?"
> - telnet to port 5666 on target machine from Nagios machine fails
> 
> 
> - telnet to localhost:5666 on target machine fails;
> [root at cache01 xinetd.d]# telnet
> telnet> open xxx.xxx.xxx.xxx 5666
> Trying xxx.xxx.xxx.xxx...
> Connected to xxx.xxx.xxx.xxx.
> Escape character is '^]'.
> Connection closed by foreign host. (Which happens instantaneously)
> 
> 
> - xinetd _is_ listening on port 5666 on the target machines;
> [root at cache01 xinetd.d]# netstat -pan | grep
> tcp        0      0 0.0.0.0:5666            0.0.0.0:*         
>       LISTEN
> 5320/xinetd
> 
> 
> - strace printout of a commandline "./check_nrpe 
> xxx.xxx.xxx.xxx -p 5666 -c
> check_users" to a machine on the same subnet
> ...
> ...
> send(3, 
> "\0\0\0\1\0\0\0\1\0\0\0\0\0\0\0\vcheck_users\0\0\0\0\0"..., 1040,
> 0) = 1040
> time([1038894731])                      = 1038894731
> recv(3, 0xbffff2e0, 1040, 0)            = -1 ECONNRESET 
> (Connection reset
> by peer)
> fstat64(1, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 1), ...}) = 0
> mmap2(NULL, 4096, PROT_READ|PROT_WRITE, 
> MAP_PRIVATE|MAP_ANONYMOUS, -1, 0)
> = 0x40014000
> write(1, "CHECK_NRPE: Error receiving data"..., 44CHECK_NRPE: Error
> receiving data from host.
> ) = 44
> close(3)                                = 0
> alarm(0)                                = 10
> munmap(0x40014000, 4096)                = 0
> _exit(3)                                = ?
> 
> 
> 
> - strace printout of a commandline "./check_nrpe 
> xxx.xxx.xxx.xxx -p 5666 -c
> check_users" to a machine on a different subnet
> ...
> ...
> send(3, 
> "\0\0\0\1\0\0\0\1\0\0\0\0\0\0\0\vcheck_users\0\0\0\0\0"..., 1040,
> 0) = 1040
> time([1038894876])                      = 1038894876
> recv(3, "", 1040, 0)                    = 0
> fstat64(1, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 1), ...}) = 0
> mmap2(NULL, 4096, PROT_READ|PROT_WRITE, 
> MAP_PRIVATE|MAP_ANONYMOUS, -1, 0)
> = 0x40014000
> write(1, "CHECK_NRPE: Received 0 bytes.  A"..., 70CHECK_NRPE: 
> Received 0
> bytes.
>  Are we allowed to connect to the host?
> ) = 70
> close(3)                                = 0
> alarm(0)                                = 10
> munmap(0x40014000, 4096)                = 0
> _exit(3)                                = ?
> 
> 
> I have to admit that i'm still pretty much in holiday mood so 
> there could
> be something ridiculously simple I am missing (here's hoping) but I am
> getting to the end of my useful troubleshooting ideas, so any 
> light from
> any listmembers would be greatly appreciated.
> 
> Thanks to all,
> 
> Andrew Slater
> 
> 
> 
> 
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