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Asked: 2026-05-26T11:27:19+00:00

I’m trying to connect to a service, and to debug it, I ran netstat

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I’m trying to connect to a service, and to debug it, I ran

netstat -nap | grep LISTEN

The results should rows of two types : 

tcp 0 0 127.0.0.1:8020 0.0.0.0:*     LISTEN      
tcp 0 0 0.0.0.0:57140  0.0.0.0:*     LISTEN      
tcp 0 0 0.0.0.0:11000  0.0.0.0:*     LISTEN      
tcp 0 0 0.0.0.0:8088   0.0.0.0:*     LISTEN 
unix 2 [ ACC ]  STREAM LISTENING     4512   -                   
unix 2 [ ACC ]  STREAM LISTENING     9760   -

I have 3 questions :

1) I want to connect to the process running on 127.0.0.1 — how can I do this externally ? I have read elsewhere that 127.0.0.1 processes are only allowed to communicate with other localhost processes.

2) What is the difference between the “tcp 0” netstat records and the “unix 2” ones ? Im somewhat naive about networking, so feel free to overexplain this one 🙂

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1 Answer

  1. Editorial Team

    1) You would either need to modify the server to bind to a publicly accessible address (or 0.0.0.0) or run a local proxy to handle the connection.

    2) TCP connections use the TCP protocol, the one used for connection-oriented traffic on the Internet. UNIX connections use a strictly local protocol that is much simpler than TCP (because it doesn’t have to deal with dropped packets, lost routes, corrupted data, out of order packets, and so on).

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