TCL error in running iRule

You're correct; you can just use TCP::local_port. There is no 'TCP::port' command. There is an IP::addr command to compare IP addresses. You could also replace the if chain with a switch statement:

 
 when CLIENT_ACCEPTED { 
  
     Check the client's requested port (the local port) 
    switch [TCP::local_port] { 
       "25" - 
       "110" - 
       "1723" - 
       "1701" { 
          pool HGC_Persistent_GW 
       } 
       default { 
          if {[IP::addr [IP::local_addr] equals 118.143.13.0/24]}{ 
             pool HGC_Pool 
          } elseif {[IP::addr [IP::local_addr] equals 203.186.55.0/24]}{ 
             pool HKBN_Pool 
          } 
       } 
    } 
 } 
 

Aaron