irule to block URL to specific source IP

I've amended your first iRule to log at various stages of execution. Please could you try the rule and post your log entries.

when HTTP_REQUEST { 
    log local0. "CLIENT IP: [IP::client_addr] URI: [HTTP::uri]"
    if {[IP::client_addr] equals "192.168.100.201"}{ 
        log local0. "FIRST IF"
        if {[string tolower [HTTP::uri]] ne "/cvs/chn.website.cvs.account_1.0?wsdl"} { 
            log local0. "SECOND IF"
            drop 
        } 
    } 
}