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Re: No data was received from host!
Posted: Wed Aug 16, 2017 4:56 pm
by tgriep
Please post the nsclient.log file so we can check it for errors.
Re: No data was received from host!
Posted: Thu Aug 17, 2017 1:38 am
by robert.anderko
hi all,
fresh installation of NSclient++ 0.4.4.23-x64 with nsclient.ini from my previous post
On target system:
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netstat -an |findstr 12489
TCP 0.0.0.0:12489 0.0.0.0:0 LISTENING
TCP 0.0.0.0:12489 0.0.0.0:0 LISTENING
TCP 10.82.186.11:12489 0.0.0.0:0 LISTENING
TCP 10.82.186.11:12489 10.82.186.11:50121 ESTABLISHED
TCP 10.82.186.11:50121 10.82.186.11:12489 ESTABLISHED
TCP [::]:12489 [::]:0 LISTENING
From Nagios server:
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nmap 10.82.186.11 -p T:12489
Starting Nmap 6.47 ( http://nmap.org ) at 2017-08-17 08:29 CEST
Nmap scan report for cz-prgfts011 (10.82.186.11)
Host is up (0.00058s latency).
PORT STATE SERVICE
12489/tcp open unknown
Nmap done: 1 IP address (1 host up) scanned in 0.09 seconds
&
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telnet 10.82.186.11 12489
Trying 10.82.186.11...
Connected to 10.82.186.11.
Escape character is '^]'.
^CConnection closed by foreign host.
From my point of view all seems fine - nsclient++ listening on port 12489, nsclient++ is accessible from Nagios server, communication between Nagios and client is allowed.
I trying run:
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/usr/local/nagios/libexec/check_nt -H 10.82.186.11 -s "" -p 12489 -v CPULOAD -l 5,90,95
No data was received from host!
could not fetch information from server
On target system i see - connection from Nagios server is Established
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netstat -an |findstr 12489
TCP 0.0.0.0:12489 0.0.0.0:0 LISTENING
TCP 0.0.0.0:12489 0.0.0.0:0 LISTENING
TCP 10.82.186.11:12489 0.0.0.0:0 LISTENING
TCP 10.82.186.11:12489 10.43.174.4:60922 ESTABLISHED
TCP 10.82.186.11:12489 10.82.186.11:50121 ESTABLISHED
TCP 10.82.186.11:50121 10.82.186.11:12489 ESTABLISHED
TCP [::]:12489 [::]:0 LISTENING
Log file on attach
Re: No data was received from host!
Posted: Thu Aug 17, 2017 8:19 am
by robert.anderko
resolved. please close
Re: No data was received from host!
Posted: Thu Aug 17, 2017 8:39 am
by tgriep
To help out other people, what did you do to resolve the issue?
Re: No data was received from host!
Posted: Thu Aug 17, 2017 9:33 am
by robert.anderko
debug:c:\source\nscp\include\socket/server.hpp:95: Binding to: 0.0.0.0:12489(ipv4), reopen: true, reuse: true
debug:c:\source\nscp\include\socket/server.hpp:202: Attempting to bind to: 0.0.0.0:12489(ipv4)
This was tested with netstat:
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netstat -an |findstr 12489
TCP 0.0.0.0:12489 0.0.0.0:0 LISTENING
TCP 0.0.0.0:12489 0.0.0.0:0 LISTENING
TCP 10.82.186.11:12489 0.0.0.0:0 LISTENING
TCP 10.82.186.11:12489 10.43.174.4:60922 ESTABLISHED
TCP 10.82.186.11:12489 10.82.186.11:50121 ESTABLISHED
TCP 10.82.186.11:50121 10.82.186.11:12489 ESTABLISHED
TCP [::]:12489 [::]:0 LISTENING
Due this informations i had in minds "NSClient works fine and listening for connections" .
I stopping NSCP service and run netstat on to TCP port 12489. And positive match:
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netstat -ano |findstr 12489
TCP 10.82.186.11:12489 0.0.0.0:0 LISTENING 19104
TCP 10.82.186.11:12489 10.43.174.4:57928 ESTABLISHED 19104
TCP 10.82.186.11:12489 10.43.174.4:57934 ESTABLISHED 19104
TCP 10.82.186.11:12489 10.82.186.11:50121 ESTABLISHED 19104
TCP 10.82.186.11:50121 10.82.186.11:12489 ESTABLISHED 2192
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tasklist /svc /FI "PID eq 19104"
Image Name PID Services
========================= ======== ============================================
java.exe 19104 N/A
Its clear and understable? But question is - why is in debug log from nsclient info about binding to the TCP port, when this is not a true?
Re: No data was received from host!
Posted: Thu Aug 17, 2017 12:20 pm
by tgriep
Ah, so there was another process using port 12489 and it was conflicting with NSClient++ and that was causing the error.
I am guessing that the log entry is just saying that it is trying to listen on that port but is not checking that is actually can.
Glad you figured it out.