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Hi Diane!

Afedden had an excellent suggestion above with the TCP reset debut. Meanwhile, the ltm log in the web interface is rotated every day. In order to see the issues from ie. yesterday you must login with SSH and check the old logs (ltm.1.gz, ltm.2.gz, etc).

You can check the content by running:

zcat /var/log/ltm.1.gz | less

When the site is down, is the whole site down or just parts of it? What happens if you attempt to browse the monitor file from your client when the problems occurrs?

http://stage.cardiosource.org/lbtest.aspx

Running this command will show you the reasons for resets since the counter was reset the last time (from the SSH terminal):

tmsh show net rst-cause

When the problem occurrs next time I'd advise you to reset the counter and then show the causes again (from the SSH terminal):

tmsh reset net rst-cause
tmsh show net rst-cause

Explanations for the causes can be found in the article afedden linked to:

http://support.f5.com/kb/en-us/solutions/public/13000/200/sol13223.html

Summary:

• If you can't load the monitor page when the problems occurrs and the pool members are green it'd indicate that there are some issues on the way.
• Check the ltm logs as instructed above to verify that nothing actually went down.
• Run the rst cause

Some additional questions:

• Could you please post the result of the rst-cause before you reset the counter?
• Could you please let me know the monitor interval and timeout?
• Do you use the default tcp profile on the virtual server?

Please note that I'm in Sweden so my answers might be a bit late. 🙂

/Patrik