Witness Block Error due to Block Too Old

Most blocks missing are due to "attempting to push a block that is too old"

This is thrown at: https://github.com/steemit/steem/blob/ff9b801615ba8c347a0c3f534ad06adc551b58e5/libraries/chain/fork_database.cpp#L57

void  fork_database::_push_block(const item_ptr& item)
{
   if( _head ) // make sure the block is within the range that we are caching
   {
      FC_ASSERT( item-&gt;num &gt; std::max<int64_t>( 0, int64_t(_head-&gt;num) - (_max_size) ),
                 "attempting to push a block that is too old",
                 ("item-&gt;num",item-&gt;num)("head",_head-&gt;num)("max_size",_max_size));
   }

   if( _head &amp;&amp; item-&gt;previous_id() != block_id_type() )
   {
      auto&amp; index = _index.get<block_id>();
      auto itr = index.find(item-&gt;previous_id());
      STEEM_ASSERT(itr != index.end(), unlinkable_block_exception, "block does not link to known chain");
      FC_ASSERT(!(*itr)-&gt;invalid);
      item-&gt;prev = *itr;
   }

   _index.insert(item);
   if( !_head || item-&gt;num &gt; _head-&gt;num ) _head = item;
}

That is caused by: when the witness server is to slow to generate a block within 3 seconds - even it managed to generate a block shortly afterwards, it is too late (the block is missed)

How to avoid this? Make sure a good network connection (low latency) is one first thing to check.

Also, make sure the time/clock (NTP) on the server is accurately synchronized.

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