4 and a half years doing socket/network programming and I only just learnt my understanding of TCP was largely incorrect...

Well then... That's something...

Look at it this way. Now you have 4.5 years worth of job security.

Give us more info :)

@pajaja basically I've always had it in head that TCP assigned a new port for each connection it accepted but actually it serves them all off the same port. Which really makes a lot more sense...

Unfortunately there's a lot of major implications on some of the UDP stuff I'm doing since it was designed to work like I thought TCP did, hence I now need to rewrite a lot of it.

It's only now, struggling to get my UDP code to break through NAT, I come to realise it's horrifically wrong in many ways 😛