client not support ssl to ssl supported server

You should be able to achieve this with a serverSSL profile on your virtual server. 

If only this very specific traffic needs encryption, you could add an "else" statement with SSL::disable serverside command in addition to serverSSL profile.. something like this

when HTTP_REQUEST {
 set nossl 1
 if {[IP::addr [IP::client_addr] equals "10.10.10.10"]} {
  HTTP::header replace Host "xyz"
  pool another_pool-443
  HTTP::uri "abcwq/"
  set nossl 0
 }
}
when SERVER_CONNECTED {
  if {$nossl}{ SSL::disable } 
}