Dropping packet with invalid CRC32...

[stewartp]

Hi

I have been running Nagios XI and NSClient++ on about 9 remote MS Windows servers for a year now with great success. However, yesterday my Nagios server blew up, and I could not successfully boot the hard drive in another server, so I had to reinstall from scratch. I ended up with CentOS 5.8 running Nagios XI 2011R3.3

The nsca version is 2.9.1 and the NSClient++ on the remote windows servers remains unchanged, although I did update one to NSCP 0.4.0.183-Win32 to see if that made any difference.

The error I am getting in /var/log/messages is :-
Handling the connection...
Dropping packet with invalid CRC32 - possibly due to client using wrong password or crypto algorithm.
EXIT nsca status=0 pid=12264 duration=0(secs)

I know the password and is the same across the servers and Nagios, and the encryption method is DES (2) on all.

I am really stuck now, so any help would be appreciated.

Regards Stewart

[scottwilkerson]

We have found on some systems NSClient just isn't playing nicely with NSCA 2.9.1

You can downgrade NSCA to 2.7.2 by running the following

Code: Select all

wget http://assets.nagios.com/downloads/nagiosxi/agents/nsca-downgrade.tar.gz
tar xvf nsca-downgrade.tar.gz
cd nsca
./upgrade

[stewartp]

Amazing,
After three days of tearing my hair out your solutions solved the issues. All my external servers are registering perfectly. Thank you so much!!