Isn't SCTP supposed to support 65536 data streams? If I try to enable that many I get 10. Not surprising since the number of streams gets stored in a u16. The whole code base may need changing to save the highest valid stream? Since I don't actually need that many I'm not writing the patch. David - Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK Registration No: 1397386 (Wales)