Vip is always up even if the servers behind service port are down

Do you mean that the VIP is UP or that it always accepts a 3-way handshake?

are you using pool command in the irule?

if yes, can you try to remove the irule just for testing?

@ IheartF5 yes we can telnet to the vip and vip is green and active up @ nitass no irule associated to this vip

@ nitass no irule associated to this vip

rules SNAT2VIP

So that says to me that your "tcp half open" monitor is not right - if the monitor passes then the F5 will think the pool/virtual is UP. If you think the servers are actually DOWN and want the F5 to think so too, then adjust your check - like use an http-based check.

Standard VIP always accepts 3-way handshake.

Is there any way to avoid that @ aFanen01 as per my requirement need to down the vip also when the servers behind service port are down

No. You will have to use an extended monitor. Example, HTTP, or full TCP monitor that sends some data and looks for something in the output returned by the server.

A standard VIP will only terminate a connection after it receives data, and then does not find a pool member to send it to.

Alternatively, a Performance-L4 VIP will fail on the first SYN if there is no pool member, but you lose all the layer 7 capabilities of a standard VIP.

b pool remotepc.com_p_9010 shows pool members are down ? Also this one is an L7 VIP which is having http-xff with tcp profile. It will also respond for telnet

if you do not want 3-way handshake when pool is down, you need to disable virtual server or turn off virtual address arp.

Toggle Virtual Address ARP

Mark the status of a virtual server down