It’s been a few weeks since I started trying to solve this problem, but I 
still haven’t figured out a possible solution. The issue is that my server 
accepts requests and responds to them normally in the beginning. However, 
after an unknown event happens (I’m still trying to discover which event it 
is), the server continues accepting requests, but it stops responding to 
them.

 

I’ve already checked the Process Monitor (the server is running on Windows 
Server 2012 R2) and I could notice that when this problem happens, new 
requests generate a TCP Accept, a TCP Receive, but not a TCP Send nor a 
Disconnect.

 

I tried to execute the server in debug mode, but then again, when this 
problem happens the debugger does not work and it hangs up as well.

 

The server doesn’t explode and no errors occur. Thus, domains won’t help me 
in this case. I’ve tried to handle uncaughtException, but it also didn’t 
work.

 

The server keeps running without using excessive processor or memory 
resources. Its behavior is still similar to the one during the first 
execution, except for the fact that it’s not responding as it was before.

 

When I sent a SIGNAL via console, the server simply started working 
normally again without restarting or anything. It just got back to normal.

 

I tried to execute a lot of requests using ApacheBench and NeoLoad, but I 
just can’t reproduce this problem. It simply happens randomly.

 

The socket has a timeout of two minutes. However, the server keeps hanging 
up the requests for hours.

 

When I sent the SIGNAL mentioned before, all requests that were hanging 
were executed, as if they were in a queue waiting for the last request to 
be finished.

 

I don’t know what else could I do to find out what is causing this problem.


I'm using Node.js + Express + body-parser + cookie-parser + Windows Server 
2012 R2 x64 with GUI + Amazon EC2 micro instance.


*If somebody has any idea of what is causing the server to hang up forever, 
please tell me.*


Best Regards,

*Moacir Braga*

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