<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 TRANSITIONAL//EN"> <HTML> <HEAD> <META HTTP-EQUIV="Content-Type" CONTENT="text/html; CHARSET=UTF-8"> <META NAME="GENERATOR" CONTENT="GtkHTML/3.26.3"> </HEAD> <BODY> I'm running nagios 3.0.6 with plugins 1.4.13 both compiled from source on a debian machine. We recently added dataprobe iboot remote power switches to my network. They have basic web authentication, but the authentication only uses a password, not a username. I tried several different things with the -a modifier to check_http, and all failed to get an OK result from the plugin. Among the tests were - -a \n:PASS -a \r:PASS -a *:PASS -a :PASS -a garbage:PASS All of the tests lead to a 401 error, as shown in this verbose output - /usr/local/nagios/libexec/check_http -I 192.168.1.254 -a \n:PASS -v GET / HTTP/1.0 User-Agent: check_http/v2053 (nagios-plugins 1.4.13) Connection: close Authorization: Basic bjpyZWJvb3Q= http://192.168.1.254:80/ is 97 characters STATUS: HTTP/1.0 401 Not Authorized **** HEADER **** WWW-Authenticate: Basic realm="iBoot" **** CONTENT **** <html><h2>Error</h2></html> HTTP WARNING: HTTP/1.0 401 Not Authorized Is there some way to pass an empty or null username to this device? When authenticating as a human through a browser, leaving the username empty and the default password of PASS lets you in. Thanks for any suggestions! </BODY> </HTML>