I had a migration this last weekend. I ran into an issue that most of the servers would fail HTTP probes, but when configured for ICMP the servers would answer it's probe and load balancing works fine.
Unfortunatley; I did not save the outputs of the show probe detail commands, but I would guess that it was very generic like the one you posted.
port : 80 address : 0.0.0.0 addr type : -
interval : 10 pass intvl : 10 pass count : 3
fail count: 3 recv timeout: 10
http method : GET
http url : /
conn termination : GRACEFUL
expect offset : 0 , open timeout : 1
expect regex : -
send data : -
There were no FW or ACL change for the migration. Load balancing is working fine once I configured the probe to ICMP. My probe is configured to probe the header of the page and not a specific URL. I wonder if this symptom only occurs when the webpage does not have a default page configured.
I do remember during the brief time period I had to troubleshoot that when I tried to view the default page via telnet "telnet 10.10.10.10 80" it would connect to port 80, but when I entered "GET /" I would get a 404 error on some servers or I would get nothing on others.
If you still want to troubleshoot aside of the prod serverfarm, you can configure a dummy serverfarm, add an rserver that had those problems and define your HTTP probe under it. Logically, it would still fail but you will be able to see the error using the show probe XXX detail command.
If you want, post your config of your probe, your rserver and the output of the show probe xxx detail command.
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