Forum Discussion

justin_westover's avatar
justin_westover
Icon for Nimbostratus rankNimbostratus
Jul 09, 2014

HTTP Monitor not working

I have a very simple HTTP monitor configured that isn't working. When looking in the IIS logs the F5 isn't sending the send string and I can change the send string to anything "GET /blablabla" and th...
application delivery
deployment
LTM
TMSH
uni's avatar
uni
Icon for Altostratus rankAltostratus
Jul 09, 2014

You will need a receive string configured - a string which must be in the response. Without it, all you're really doing is checking that the TCP connection succeeds. You could start with something simple like "200 OK"

 

  • justin_westover's avatar
    justin_westover
    Icon for Nimbostratus rankNimbostratus
    Jul 09, 2014
    So I have tried putting the receive string in but then I have the opposite problem and the node stays down. I setup a receive string to look for "200 OK" (no quotes) and also for "CSS Test file" as you will see below, this string is returned in the body of the GET query. I have included a telnet from the F5 on port 10000 and then a GET and the reply from the server. What would you match in this case? [root@F5_01:Active:Changes Pending] config telnet 172.16.101.65 10000 Trying 172.16.101.65... Connected to 172.16.101.65. Escape character is '^]'. GET /css.htm CSS Test file Connection closed by foreign host. If I match 200 OK or CSS Test file the node stay down until I remove the receive string. Thoughts?
  • uni's avatar
    uni
    Icon for Altostratus rankAltostratus
    Jul 09, 2014
    Is this an IIS server? You should really put the HTTP version in your GET request: "GET /css.htm HTTP/1.0" or better yet "GET /css.htm HTTP/1.1\r\nHost: www.myhost.com\r\nConnection: close\r\n\r\n"