I can't tell you why it happens, but if you comment out the following line in common\EQStream.cpp it will stop:
Code:
if(CompareSequence(NextOutSeq, seq_send) == SeqFuture) {
//_log(NET__ERROR, _L "Tried to write a packet beyond the end of the queue! (%d is past next out %d)" __L, seq_send, NextOutSeq);
sitr=SequencedQueue.end();
However, someone else can probably tell you what it means and how to actually stop it from happening (the above will just tell you how to ignore it).
In looking over that portion of the code, it looks like what is happening is that the server is receiving the packets out of sequence. In this case, it is expecting the response for 40898 and got back the response for 40899. So the server is wondering where 40898 went since it doesn't have that information.
I would expect this to happen on a high latency network where a lot of packets are getting dropped. However, I may be barking up the wrong tree.
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