I am getting this message as the message for Component Status details; 500 Unknown command. What does this mean, as the command hasn't changed and works other times.
Please help decipher this.
thank you
Hello scott,what type of component is it?
The component/s are FTP monitors.
This component monitor tests the ability of an FTP server to accept incoming sessions, process user logins, and then transmit the requested file. The component monitor performs an MD5 checksum comparison on the downloaded file to verify content integrity.
Have you changed version of FTP server recently? Error message says that target server doesn't know one of commands APM sends to it. Is that FTP working correctly if you connect to it using some FTP client?
We’re running ‘vsftp’ which is a 3rd party ftp package – but it has been installed on the machine for a long time. Yes FTP is working correctly as well. What is odd is the monitor will work one poll, fail another and another, then pass, then fail, all with the error described.
Have you tried "passive mode" for FTP monitor? Error 500 can sometimes occur if firewall is not configured correctly and FTP is trying to use some blocked port. Using passive mode can solve this.
Passive mode didn't work but thanks.
Is there any connection limit for vsftp? I asked the UNIX admin to send me the ftp settings and I see no limit in the settings but I am wondering if it only allows 3 connections at a time. The reason I ask is the template we have setup has 5 ftp monitors trying to connect at the same time.
Are those monitors connecting to the same FTP? Maybe that server doesn't allow multiple connections from the same computer with the same credentials.
Same ftp but different credentials for each. I've checked the vsftpd.conf file the UNIX admin sent and cannot find a setting for max_per_ip. It is not in the file at all.
