text: ### Instruction: Please extract the template of the following log line:
  ### Input: local-p2p.qq.com:443 error : Could not connect through proxy proxy.cse.cuhk.edu.hk:5070 - Proxy server cannot establish a connection with the target, status code 503
  ### Template: <*>:<*> error : Could not connect through proxy <*>:<*> - Proxy server cannot establish a connection with the target, status code <*>