Error: connect EADDRNOTAVAIL while processing big async loop

I am experiencing a very strange problem. I am importing some big xml-files and store them into mongoDB. The algorythm is a typical async loop: ``` doLoop = function( it, callback_loop ) { if( it < no_of_items ) { storeToMongo( ..., function( err, result ) { ... doLoop( it+1, callback_loop ); }); } else { callback_loop(); } }; doLoop( 0, function() { ... }); ``` Now (suddenly without any remarkable change in the code) I get the following error while performing the loop: ``` events.js:72 throw er; // Unhandled 'error' event ^ Error: connect EADDRNOTAVAIL at errnoException (net.js:901:11) at connect (net.js:764:19) at net.js:842:9 at dns.js:72:18 at process._tickCallback (node.js:415:13) ``` The error happens after approximately a minute. The number of items processed in the meantime is always quite the same, but not exactly. I tried to find out what `connect/net` causes the error, but I am lost. There is not socket-connection in my code. I have a connection to redis, but that is o.k. Is it the mongoDB-connection? But why does it get lost suddenly? The only thing that helps to run through the whole loop is to perform the recursive loop call within the mongo-callback like this: ``` setTimeout( function() { doLoop( it+1, callback_loop ); },1); ``` Anyone out there who has an idea what is going wrong here? Thanks, heinob