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Tim Dunphy

2015-May-01 05:32 UTC

[CentOS] Could not complete SSL handshake to Amazon EC2 host

Hi Eric,

 Thanks for your reply. I do have nrpe running under xinetd on the host I'm
trying to monitor.

 And running the nrpe checl locally:

[root at ops:~] #/usr/local/nagios/libexec/check_nrpe -H localhost
NRPE v2.15

[root at ops:~] #grep only_from /etc/xinetd.d/nrpe
        only_from       = 127.0.0.1 216.120.248.126

And I do have port 5666 open on the security group for this host.

And I made sure the local firewall was stopped, because I am blocking ports
with the security groups instead.

[root at ops:~] #service iptables status
Firewall is stopped.

It's only when checking from the monitoring host that nrpe fails:

[root at monitor1:~] #/usr/local/nagios/libexec/check_nrpe -H ops.jokefire.com
CHECK_NRPE: Error - Could not complete SSL handshake.

Really, really puzzling. This is driving me up a wall!! I hopeI can solve
this soon....

Thanks for any and all help with this one!!
Tim

On Fri, May 1, 2015 at 1:02 AM, Eric Lehmann <e.lehmann88 at gmail.com>
wrote:
> Hi
> Does the deamon run under xinetd? Then  you have to configure the only_from
> in  */etc/**xinetd.d**/**nrpe* to.
>
> Regards
> Eric
> Am 01.05.2015 06:46 schrieb "Tim Dunphy" <bluethundr at
gmail.com>:
>
> > Hello,
> >
> >  I am trying to monitor a host in the Amazon EC2 cloud.
> >
> > Yet when I try to check NRPE from the monitoring host I am getting an
SSL
> > handshake error:
> >
> > [root at monitor1:~] #/usr/local/nagios/libexec/check_nrpe -H
> > ops.jokefire.com
> > CHECK_NRPE: Error - Could not complete SSL handshake.
> >
> > And if I telnet into the host on port 5666 to see if the FW port is
open,
> > the connection closes right away:
> >
> > [root at monitor1:~] #telnet ops.somewhere.com 5666
> > Trying 54.225.218.125...
> > Connected to ops.somewhere.com.
> > Escape character is '^]'.
> > Connection closed by foreign host.
> >
> > You can see there it connects, but then it closes immediately after
the
> > connection.
> >
> >  I have NRPE running on the host I want to monitor:
> >
> > [root at ops:~] #lsof -i :5666
> > COMMAND  PID USER   FD   TYPE DEVICE SIZE NODE NAME
> > xinetd  1434 root    5u  IPv4   4063       TCP *:nrpe (LISTEN)
> >
> > And I have the IP of my nagios server listed in the xinetd conf file:
> >
> > [root at ops:~] #cat /etc/xinetd.d/nrpe
> > # default: on
> > # description: NRPE (Nagios Remote Plugin Executor)
> > service nrpe
> > {
> >         flags           = REUSE
> >         socket_type     = stream
> >         port            = 5666
> >         wait            = no
> >         user            = nagios
> >         group           = nagios
> >         server          = /usr/local/nagios/bin/nrpe
> >         server_args     = -c /usr/local/nagios/etc/nrpe.cfg --inetd
> >         log_on_failure  += USERID
> >         disable         = no
> >         only_from       = 127.0.0.1 xx.xx.xx.xx   # <- representing
my
> real
> > nagios server IP
> > }
> >
> >
> >
> > And I have my default security group for that host open on port 5666
to
> the
> > world for this experiment.  I plan on locking that down again to the
> single
> > IP of my monitoring host once I get this resolved.
> >
> > Does anyone have any suggestions on how I can get that problem solved?
> >
> > Thanks,
> > Tim
> >
> > --
> > GPG me!!
> >
> > gpg --keyserver pool.sks-keyservers.net --recv-keys F186197B
> > _______________________________________________
> > CentOS mailing list
> > CentOS at centos.org
> > http://lists.centos.org/mailman/listinfo/centos
> >
> _______________________________________________
> CentOS mailing list
> CentOS at centos.org
> http://lists.centos.org/mailman/listinfo/centos
>


-- 
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Eric Lehmann

2015-May-01 09:46 UTC

head link

[CentOS] Could not complete SSL handshake to Amazon EC2 host

This is strange...
Do you have SSL aktive on both systems? Run nrpr localy without parameters
(this should return some nrpe stats) and check ldd for libssl.
Am 01.05.2015 07:32 schrieb "Tim Dunphy" <bluethundr at
gmail.com>:
> Hi Eric,
>
>  Thanks for your reply. I do have nrpe running under xinetd on the host
I'm
> trying to monitor.
>
>  And running the nrpe checl locally:
>
> [root at ops:~] #/usr/local/nagios/libexec/check_nrpe -H localhost
> NRPE v2.15
>
> [root at ops:~] #grep only_from /etc/xinetd.d/nrpe
>         only_from       = 127.0.0.1 216.120.248.126
>
> And I do have port 5666 open on the security group for this host.
>
> And I made sure the local firewall was stopped, because I am blocking ports
> with the security groups instead.
>
> [root at ops:~] #service iptables status
> Firewall is stopped.
>
> It's only when checking from the monitoring host that nrpe fails:
>
> [root at monitor1:~] #/usr/local/nagios/libexec/check_nrpe -H
> ops.jokefire.com
> CHECK_NRPE: Error - Could not complete SSL handshake.
>
> Really, really puzzling. This is driving me up a wall!! I hopeI can solve
> this soon....
>
> Thanks for any and all help with this one!!
> Tim
>
> On Fri, May 1, 2015 at 1:02 AM, Eric Lehmann <e.lehmann88 at
gmail.com>
> wrote:
>
> > Hi
> > Does the deamon run under xinetd? Then  you have to configure the
> only_from
> > in  */etc/**xinetd.d**/**nrpe* to.
> >
> > Regards
> > Eric
> > Am 01.05.2015 06:46 schrieb "Tim Dunphy" <bluethundr at
gmail.com>:
> >
> > > Hello,
> > >
> > >  I am trying to monitor a host in the Amazon EC2 cloud.
> > >
> > > Yet when I try to check NRPE from the monitoring host I am
getting an
> SSL
> > > handshake error:
> > >
> > > [root at monitor1:~] #/usr/local/nagios/libexec/check_nrpe -H
> > > ops.jokefire.com
> > > CHECK_NRPE: Error - Could not complete SSL handshake.
> > >
> > > And if I telnet into the host on port 5666 to see if the FW port
is
> open,
> > > the connection closes right away:
> > >
> > > [root at monitor1:~] #telnet ops.somewhere.com 5666
> > > Trying 54.225.218.125...
> > > Connected to ops.somewhere.com.
> > > Escape character is '^]'.
> > > Connection closed by foreign host.
> > >
> > > You can see there it connects, but then it closes immediately
after the
> > > connection.
> > >
> > >  I have NRPE running on the host I want to monitor:
> > >
> > > [root at ops:~] #lsof -i :5666
> > > COMMAND  PID USER   FD   TYPE DEVICE SIZE NODE NAME
> > > xinetd  1434 root    5u  IPv4   4063       TCP *:nrpe (LISTEN)
> > >
> > > And I have the IP of my nagios server listed in the xinetd conf
file:
> > >
> > > [root at ops:~] #cat /etc/xinetd.d/nrpe
> > > # default: on
> > > # description: NRPE (Nagios Remote Plugin Executor)
> > > service nrpe
> > > {
> > >         flags           = REUSE
> > >         socket_type     = stream
> > >         port            = 5666
> > >         wait            = no
> > >         user            = nagios
> > >         group           = nagios
> > >         server          = /usr/local/nagios/bin/nrpe
> > >         server_args     = -c /usr/local/nagios/etc/nrpe.cfg
--inetd
> > >         log_on_failure  += USERID
> > >         disable         = no
> > >         only_from       = 127.0.0.1 xx.xx.xx.xx   # <-
representing my
> > real
> > > nagios server IP
> > > }
> > >
> > >
> > >
> > > And I have my default security group for that host open on port
5666 to
> > the
> > > world for this experiment.  I plan on locking that down again to
the
> > single
> > > IP of my monitoring host once I get this resolved.
> > >
> > > Does anyone have any suggestions on how I can get that problem
solved?
> > >
> > > Thanks,
> > > Tim
> > >
> > > --
> > > GPG me!!
> > >
> > > gpg --keyserver pool.sks-keyservers.net --recv-keys F186197B
> > > _______________________________________________
> > > CentOS mailing list
> > > CentOS at centos.org
> > > http://lists.centos.org/mailman/listinfo/centos
> > >
> > _______________________________________________
> > CentOS mailing list
> > CentOS at centos.org
> > http://lists.centos.org/mailman/listinfo/centos
> >
>
>
>
> --
> GPG me!!
>
> gpg --keyserver pool.sks-keyservers.net --recv-keys F186197B
> _______________________________________________
> CentOS mailing list
> CentOS at centos.org
> http://lists.centos.org/mailman/listinfo/centos
>

Tim Dunphy

2015-May-01 11:14 UTC

head link

[CentOS] Could not complete SSL handshake to Amazon EC2 host

> This is strange...
> Do you have SSL aktive on both systems? Run nrpr localy without parameters
> (this should return some nrpe stats) and check ldd for libssl.

I don't seem to have that command.


[root at monitor1:~] #find / -name "*nrpr" 2> /dev/null
[root at monitor1:~] #

And that's on either system.

 And if I do an ldd on both, this is what I can tell:

Server:

[root at monitor1:~] #ldd /usr/local/nagios/libexec/check_nrpe
        linux-vdso.so.1 =>  (0x00007fffd895d000)
       * libssl.so.10 => /lib64/libssl.so.10 (0x00007fc61722a000)*
*        libcrypto.so.10 => /lib64/libcrypto.so.10 (0x00007fc616e43000)*
        libnsl.so.1 => /lib64/libnsl.so.1 (0x00007fc616c29000)
        libc.so.6 => /lib64/libc.so.6 (0x00007fc616868000)
        libgssapi_krb5.so.2 => /lib64/libgssapi_krb5.so.2
(0x00007fc61661c000)
        libkrb5.so.3 => /lib64/libkrb5.so.3 (0x00007fc616338000)
        libcom_err.so.2 => /lib64/libcom_err.so.2 (0x00007fc616134000)
        libk5crypto.so.3 => /lib64/libk5crypto.so.3 (0x00007fc615f02000)
        libdl.so.2 => /lib64/libdl.so.2 (0x00007fc615cfd000)
        libz.so.1 => /lib64/libz.so.1 (0x00007fc615ae7000)
        /lib64/ld-linux-x86-64.so.2 (0x00007fc6174a0000)
        libkrb5support.so.0 => /lib64/libkrb5support.so.0
(0x00007fc6158d8000)
        libkeyutils.so.1 => /lib64/libkeyutils.so.1 (0x00007fc6156d3000)
        libresolv.so.2 => /lib64/libresolv.so.2 (0x00007fc6154b9000)
        libpthread.so.0 => /lib64/libpthread.so.0 (0x00007fc61529d000)
        libselinux.so.1 => /lib64/libselinux.so.1 (0x00007fc615077000)
        libpcre.so.1 => /lib64/libpcre.so.1 (0x00007fc614e16000)
        liblzma.so.5 => /lib64/liblzma.so.5 (0x00007fc614bf1000)


Client:

[root at ops:~] #ldd /usr/local/nagios/libexec/check_nrpe
       * libssl.so.6 => /lib64/libssl.so.6 (0x00002aaaaaaba000)*
*        libcrypto.so.6 => /lib64/libcrypto.so.6 (0x00002aaaaad08000)*
        libnsl.so.1 => /lib64/libnsl.so.1 (0x00002aaaab05a000)
        libc.so.6 => /lib64/libc.so.6 (0x00002aaaab273000)
        libgssapi_krb5.so.2 => /usr/lib64/libgssapi_krb5.so.2
(0x00002aaaab5cc000)
        libkrb5.so.3 => /usr/lib64/libkrb5.so.3 (0x00002aaaab7fa000)
        libcom_err.so.2 => /lib64/libcom_err.so.2 (0x00002aaaaba90000)
        libk5crypto.so.3 => /usr/lib64/libk5crypto.so.3 (0x00002aaaabc92000)
        libdl.so.2 => /lib64/libdl.so.2 (0x00002aaaabeb7000)
        libz.so.1 => /lib64/libz.so.1 (0x00002aaaac0bc000)
        /lib64/ld-linux-x86-64.so.2 (0x0000555555554000)
        libkrb5support.so.0 => /usr/lib64/libkrb5support.so.0 (0x0
0002aaaac2d0000)
        libkeyutils.so.1 => /lib64/libkeyutils.so.1 (0x00002aaaac4d8000)
        libresolv.so.2 => /lib64/libresolv.so.2 (0x00002aaaac6db000)
        libselinux.so.1 => /lib64/libselinux.so.1 (0x00002aaaac8f0000)
        libsepol.so.1 => /lib64/libsepol.so.1 (0x00002aaaacb09000)


So it looks like everything is OK from the SSL end of things. Any other
ideas or suggestions?

Thanks
Tim

On Fri, May 1, 2015 at 5:46 AM, Eric Lehmann <e.lehmann88 at gmail.com>
wrote:
> This is strange...
> Do you have SSL aktive on both systems? Run nrpr localy without parameters
> (this should return some nrpe stats) and check ldd for libssl.
> Am 01.05.2015 07:32 schrieb "Tim Dunphy" <bluethundr at
gmail.com>:
>
> > Hi Eric,
> >
> >  Thanks for your reply. I do have nrpe running under xinetd on the
host
> I'm
> > trying to monitor.
> >
> >  And running the nrpe checl locally:
> >
> > [root at ops:~] #/usr/local/nagios/libexec/check_nrpe -H localhost
> > NRPE v2.15
> >
> > [root at ops:~] #grep only_from /etc/xinetd.d/nrpe
> >         only_from       = 127.0.0.1 216.120.248.126
> >
> > And I do have port 5666 open on the security group for this host.
> >
> > And I made sure the local firewall was stopped, because I am blocking
> ports
> > with the security groups instead.
> >
> > [root at ops:~] #service iptables status
> > Firewall is stopped.
> >
> > It's only when checking from the monitoring host that nrpe fails:
> >
> > [root at monitor1:~] #/usr/local/nagios/libexec/check_nrpe -H
> > ops.jokefire.com
> > CHECK_NRPE: Error - Could not complete SSL handshake.
> >
> > Really, really puzzling. This is driving me up a wall!! I hopeI can
solve
> > this soon....
> >
> > Thanks for any and all help with this one!!
> > Tim
> >
> > On Fri, May 1, 2015 at 1:02 AM, Eric Lehmann <e.lehmann88 at
gmail.com>
> > wrote:
> >
> > > Hi
> > > Does the deamon run under xinetd? Then  you have to configure the
> > only_from
> > > in  */etc/**xinetd.d**/**nrpe* to.
> > >
> > > Regards
> > > Eric
> > > Am 01.05.2015 06:46 schrieb "Tim Dunphy" <bluethundr
at gmail.com>:
> > >
> > > > Hello,
> > > >
> > > >  I am trying to monitor a host in the Amazon EC2 cloud.
> > > >
> > > > Yet when I try to check NRPE from the monitoring host I am
getting an
> > SSL
> > > > handshake error:
> > > >
> > > > [root at monitor1:~] #/usr/local/nagios/libexec/check_nrpe
-H
> > > > ops.jokefire.com
> > > > CHECK_NRPE: Error - Could not complete SSL handshake.
> > > >
> > > > And if I telnet into the host on port 5666 to see if the FW
port is
> > open,
> > > > the connection closes right away:
> > > >
> > > > [root at monitor1:~] #telnet ops.somewhere.com 5666
> > > > Trying 54.225.218.125...
> > > > Connected to ops.somewhere.com.
> > > > Escape character is '^]'.
> > > > Connection closed by foreign host.
> > > >
> > > > You can see there it connects, but then it closes
immediately after
> the
> > > > connection.
> > > >
> > > >  I have NRPE running on the host I want to monitor:
> > > >
> > > > [root at ops:~] #lsof -i :5666
> > > > COMMAND  PID USER   FD   TYPE DEVICE SIZE NODE NAME
> > > > xinetd  1434 root    5u  IPv4   4063       TCP *:nrpe
(LISTEN)
> > > >
> > > > And I have the IP of my nagios server listed in the xinetd
conf file:
> > > >
> > > > [root at ops:~] #cat /etc/xinetd.d/nrpe
> > > > # default: on
> > > > # description: NRPE (Nagios Remote Plugin Executor)
> > > > service nrpe
> > > > {
> > > >         flags           = REUSE
> > > >         socket_type     = stream
> > > >         port            = 5666
> > > >         wait            = no
> > > >         user            = nagios
> > > >         group           = nagios
> > > >         server          = /usr/local/nagios/bin/nrpe
> > > >         server_args     = -c /usr/local/nagios/etc/nrpe.cfg
--inetd
> > > >         log_on_failure  += USERID
> > > >         disable         = no
> > > >         only_from       = 127.0.0.1 xx.xx.xx.xx   # <-
representing
> my
> > > real
> > > > nagios server IP
> > > > }
> > > >
> > > >
> > > >
> > > > And I have my default security group for that host open on
port 5666
> to
> > > the
> > > > world for this experiment.  I plan on locking that down
again to the
> > > single
> > > > IP of my monitoring host once I get this resolved.
> > > >
> > > > Does anyone have any suggestions on how I can get that
problem
> solved?
> > > >
> > > > Thanks,
> > > > Tim
> > > >
> > > > --
> > > > GPG me!!
> > > >
> > > > gpg --keyserver pool.sks-keyservers.net --recv-keys F186197B
> > > > _______________________________________________
> > > > CentOS mailing list
> > > > CentOS at centos.org
> > > > http://lists.centos.org/mailman/listinfo/centos
> > > >
> > > _______________________________________________
> > > CentOS mailing list
> > > CentOS at centos.org
> > > http://lists.centos.org/mailman/listinfo/centos
> > >
> >
> >
> >
> > --
> > GPG me!!
> >
> > gpg --keyserver pool.sks-keyservers.net --recv-keys F186197B
> > _______________________________________________
> > CentOS mailing list
> > CentOS at centos.org
> > http://lists.centos.org/mailman/listinfo/centos
> >
> _______________________________________________
> CentOS mailing list
> CentOS at centos.org
> http://lists.centos.org/mailman/listinfo/centos
>


-- 
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gpg --keyserver pool.sks-keyservers.net --recv-keys F186197B

Jonathan Billings

2015-May-01 12:18 UTC

head link

[CentOS] Could not complete SSL handshake to Amazon EC2 host

On Fri, May 01, 2015 at 01:32:28AM -0400, Tim Dunphy
wrote:> [root at ops:~] #/usr/local/nagios/libexec/check_nrpe -H localhost
> NRPE v2.15
> 
> [root at ops:~] #grep only_from /etc/xinetd.d/nrpe
>         only_from       = 127.0.0.1 216.120.248.126
> 
> And I do have port 5666 open on the security group for this host.
It sounds like you've got NRPE up on your AWS system, so I think you
might need to take a closer look at your security groups to make sure
it is allowing the NRPE port in from the source you're checking from.
You could always check with a check_nrpe from another host in the same
VPC if you want to make sure its not NRPE configuration-related. 

-- 
Jonathan Billings <billings at negate.org>

Brian Miller

2015-May-01 19:18 UTC

head link

[CentOS] Could not complete SSL handshake to Amazon EC2 host

On Fri, 2015-05-01 at 01:32 -0400, Tim Dunphy wrote:> And I made sure the local firewall was stopped, because I am blocking
> ports
> with the security groups instead.
> 
> [root at ops:~] #service iptables status
> Firewall is stopped.
Does "iptables -L" show anything of note?

Tim Dunphy

2015-May-01 19:28 UTC

head link

[CentOS] Could not complete SSL handshake to Amazon EC2 host

Hi Brian,

Does "iptables -L" show anything of note?

 I'm leaving iptables off in this host. Because it's an AWS EC2 host
I'm
managing the firewall ports using the AWS security groups.

[root at ops:~] #service iptables status
Firewall is stopped.

But still, there's this...

[root at monitor1:~] #/usr/local/nagios/libexec/check_nrpe -H ops.jokefire.com
CHECK_NRPE: Error - Could not complete SSL handshake.

Sadly.... :(

Thanks for your input tho!

On Fri, May 1, 2015 at 3:18 PM, Brian Miller <centos at fullnote.com>
wrote:
> On Fri, 2015-05-01 at 01:32 -0400, Tim Dunphy wrote:
> > And I made sure the local firewall was stopped, because I am blocking
> > ports
> > with the security groups instead.
> >
> > [root at ops:~] #service iptables status
> > Firewall is stopped.
>
> Does "iptables -L" show anything of note?
>
> _______________________________________________
> CentOS mailing list
> CentOS at centos.org
> http://lists.centos.org/mailman/listinfo/centos
>

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