[LTM] Disabling sending RST on VS failure

You didn't mention the protocol for this application, but if it's HTTP and you have an http profile assigned to the VS, you could write an iRule to respond with an HTTP 503 Service Unavailable when the pool members are down.

when LB_FAILED {
    HTTP::respond 503
}

That would prevent the VS from sending a TCP RST. You could get more fancy by having the iRule close the connection after sending the 503 response.

Otherwise, you're going to have to wait until the devices can be patched. Even if the devices were connecting directly to the pool members, the pool members would send a TCP RST when the service was down.

Hope this helps.