Asked  7 Months ago    Answers:  2   Viewed   193 times

I am working with a commercial application which is throwing a SocketException with the message,

An existing connection was forcibly closed by the remote host

This happens with a socket connection between client and server. The connection is alive and well, and heaps of data is being transferred, but it then becomes disconnected out of nowhere.

Has anybody seen this before? What could the causes be? I can kind of guess a few causes, but also is there any way to add more into this code to work out what the cause could be?

Any comments / ideas are welcome.

... The latest ...

I have some logging from some .NET tracing,

System.Net.Sockets Verbose: 0 : [8188] Socket#30180123::Send() DateTime=2010-04-07T20:49:48.6317500Z

System.Net.Sockets Error: 0 : [8188] Exception in the Socket#30180123::Send - An existing connection was forcibly closed by the remote host DateTime=2010-04-07T20:49:48.6317500Z 

System.Net.Sockets Verbose: 0 : [8188] Exiting Socket#30180123::Send() -> 0#0

Based on other parts of the logging I have seen the fact that it says 0#0 means a packet of 0 bytes length is being sent. But what does that really mean?

One of two possibilities is occurring, and I am not sure which,

  1. The connection is being closed, but data is then being written to the socket, thus creating the exception above. The 0#0 simply means that nothing was sent because the socket was already closed.

  2. The connection is still open, and a packet of zero bytes is being sent (i.e. the code has a bug) and the 0#0 means that a packet of zero bytes is trying to be sent.

What do you reckon? It might be inconclusive I guess, but perhaps someone else has seen this kind of thing?

 Answers

58

This generally means that the remote side closed the connection (usually by sending a TCP/IP RST packet). If you're working with a third-party application, the likely causes are:

  • You are sending malformed data to the application (which could include sending an HTTPS request to an HTTP server)
  • The network link between the client and server is going down for some reason
  • You have triggered a bug in the third-party application that caused it to crash
  • The third-party application has exhausted system resources

It's likely that the first case is what's happening.

You can fire up Wireshark to see exactly what is happening on the wire to narrow down the problem.

Without more specific information, it's unlikely that anyone here can really help you much.

Tuesday, June 1, 2021
 
Domiik
answered 7 Months ago
46

This really is a generic error message that could mean anything. Time to get the low level network traffic sniffers to filter what is actually going wrong. Adding extra error handling try catch blocks on the server with decent logging is always a great place to start.

Saturday, July 3, 2021
 
Litty
answered 6 Months ago
Only authorized users can answer the question. Please sign in first, or register a free account.
Not the answer you're looking for? Browse other questions tagged :
 
Share