Ethernet shield (ENC28J60) design troubles
200nF on your crystal seems way too big.  Usually 20pF would be more appropriate.

Edit:  other reference designs show caps between 18pF and 33pF (here, more can be found on the interwebs).  The exact cap values depend on the crystal.   The only downside to having caps slightly too large is that the crystal will take a little longer to start.