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Forum Discussion

GLM_191985's avatar
GLM_191985
Icon for Cirrus rankCirrus
Jan 25, 2019

Monitor when set HTTP server shows down but when I set it to TCP it works

Monitor when set to HTTP server shows down but when I set it to TCP it works? why so? For Ex. server node. 10.1.1.1 port 80  
application delivery
LTM
wlopez's avatar
wlopez
Icon for Cirrocumulus rankCirrocumulus
Jan 25, 2019

The tcp monitor is a layer 4 health monitor. It only checks that it can establish a tcp connection against the pool member.

 

The http monitor is a layer 7 health monitor. It does an http request (HTTP GET) against the pool member and expects an http response.

 

In essence the pool member is probably accepting new connections on port 80 but is not responding http requests.

 

AceDawg1's avatar
AceDawg1
Icon for Nimbostratus rankNimbostratus
Jan 27, 2019

In addition, can you verify if there is/isn't a firewall between the F5 and the pool member(s)? I've seen properly configured systems without the appropriate firewall policies to allow the traffic through.