j"1LAnZuoQdcKCkpDBKQMCgziGMoPC4VQUckM.<div class="post">It is normal for some blocks not to be accepted. One connection is enough, the others are just redundant. The client will make 8 outbound connections but will accept all inbound connections (on port 8333).<br/><br/>The blocks are generated in sequence so if two nodes happen to generate at almost the same time there will be a collision and one or the other will win. If the current block count is 5000 and your node finds a suitable block 5001, but meanwhile some other node already created a 5001 and your node just didn't know because it's on a laggy connection possibly, your block won't be valid and you have to start searching for 5002. I think this is explained in the pdfs, I'm not sure.<br/><br/>Are you seeing a lot of these happen or was it just one?<br/></div> text/html
https://whatsonchain.com/tx/cff2b6d1d02c1d503b98c5c7ed5f7fe842f47fc2003fff4fbe0a06beed2f2ece