EOF everyminute

lyric at aboutus.org (Lyric Hartley) · Fri, 27 Feb 2009 11:14:52 -0800

I am seeing this in the server log

2009-02-27 11:02:50 E [protocol.c:271:gf_block_unserialize_transport]
server: EOF from peer (10.10.10.217:42659)
2009-02-27 11:03:50 E [protocol.c:271:gf_block_unserialize_transport]
server: EOF from peer (10.10.10.217:56848)
2009-02-27 11:04:50 E [protocol.c:271:gf_block_unserialize_transport]
server: EOF from peer (10.10.10.217:56851)
2009-02-27 11:05:50 E [protocol.c:271:gf_block_unserialize_transport]
server: EOF from peer (10.10.10.217:56857)
2009-02-27 11:06:50 E [protocol.c:271:gf_block_unserialize_transport]
server: EOF from peer (10.10.10.217:56866)
2009-02-27 11:07:50 E [protocol.c:271:gf_block_unserialize_transport]
server: EOF from peer (10.10.10.217:56871)
2009-02-27 11:08:52 E [protocol.c:271:gf_block_unserialize_transport]
server: EOF from peer (10.10.10.217:34543)
2009-02-27 11:09:50 E [protocol.c:271:gf_block_unserialize_transport]
server: EOF from peer (10.10.10.217:34546)
2009-02-27 11:10:50 E [protocol.c:271:gf_block_unserialize_transport]
server: EOF from peer (10.10.10.217:34558)
2009-02-27 11:11:50 E [protocol.c:271:gf_block_unserialize_transport]
server: EOF from peer (10.10.10.217:34561)

notice that it is every minute, is there a heartbeat of other process
that is causing this?