Having latest version but does not sync. Here is what we see in log:
2016-12-29 11:21:08 INFO: Burst server 1.2.7 started successfully.
2016-12-29 11:21:08 INFO: burst.mockMining not defined, assuming false
2016-12-29 11:26:17 INFO: Block not accepted
2016-12-29 11:26:33 INFO: Previous Block with ID -4467138918201488453 not found. Blacklisting ...
2016-12-29 11:27:08 INFO: Block not accepted
2016-12-29 11:27:09 INFO: Previous Block with ID -4467138918201488453 not found. Blacklisting ...
2016-12-29 11:28:49 INFO: Block not accepted
2016-12-29 11:28:55 INFO: Previous Block with ID 351013283301868924 not found. Blacklisting ...
2016-12-29 11:29:51 INFO: Block not accepted
2016-12-29 11:30:11 INFO: Previous Block with ID -4467138918201488453 not found. Blacklisting ...
2016-12-29 11:31:13 INFO: Block not accepted
2016-12-29 11:31:13 INFO: Previous Block with ID 5186080559491830541 not found. Blacklisting ...
2016-12-29 11:32:07 INFO: Block not accepted
2016-12-29 11:36:08 INFO: Block not accepted
2016-12-29 11:36:10 INFO: Previous Block with ID 5186080559491830541 not found. Blacklisting ...
2016-12-29 11:36:40 INFO: Block not accepted
2016-12-29 11:36:44 INFO: Previous Block with ID 5186080559491830541 not found. Blacklisting ...
2016-12-29 11:37:33 INFO: Block not accepted
2016-12-29 11:37:35 INFO: Previous Block with ID -4467138918201488453 not found. Blacklisting ...
2016-12-29 11:38:57 INFO: Block not accepted
2016-12-29 11:40:31 INFO: Block not accepted
2016-12-29 11:40:40 INFO: Previous Block with ID 5186080559491830541 not found. Blacklisting ...
2016-12-29 11:41:23 INFO: Block not accepted
2016-12-29 11:41:25 INFO: Previous Block with ID -4467138918201488453 not found. Blacklisting ...
Any ideas how to fix it?