How to begin to debug FATAL: invalid frontend message type 77 error messages?

Any ideas on how to debug these types of error messages?

Apr 30 01:36:02 mxlqa401 postgres[23600]: [3-1] FATAL: invalid frontend message type 77
Apr 30 01:36:02 mxlqa401 postgres[23601]: [3-1] LOG: unexpected EOF on client connection
Apr 30 01:36:02 mxlqa401 postgres[23602]: [3-1] LOG: unexpected EOF on client connection
Apr 30 01:36:13 mxlqa401 postgres[23631]: [3-1] FATAL: invalid frontend message type 77
Apr 30 01:36:13 mxlqa401 postgres[23632]: [3-1] LOG: unexpected EOF on client connection
Apr 30 01:36:13 mxlqa401 postgres[23633]: [3-1] LOG: unexpected EOF on client connection
Apr 30 01:36:24 mxlqa401 postgres[23664]: [3-1] FATAL: invalid frontend message type 77
Apr 30 01:36:24 mxlqa401 postgres[23666]: [3-1] LOG: unexpected EOF on client connection
Apr 30 01:36:24 mxlqa401 postgres[23665]: [3-1] LOG: unexpected EOF on client connection
Apr 30 01:36:35 mxlqa401 postgres[23696]: [3-1] FATAL: invalid frontend message type 77
Apr 30 01:36:35 mxlqa401 postgres[23698]: [3-1] LOG: unexpected EOF on client connection
Apr 30 01:36:35 mxlqa401 postgres[23697]: [3-1] LOG: unexpected EOF on client connection
Apr 30 01:36:46 mxlqa401 postgres[23728]: [3-1] FATAL: invalid frontend message type 77
Apr 30 01:36:46 mxlqa401 postgres[23730]: [3-1] LOG: unexpected EOF on client connection
Apr 30 01:36:46 mxlqa401 postgres[23729]: [3-1] LOG: unexpected EOF on client connection

bash-3.2$ psql -V
psql (PostgreSQL) 8.1.17
contains support for command-line editing

bash-3.2$ uname -a
Linux mxlqa401.corp.mxlogic.com 2.6.18-92.el5PAE #1 SMP Tue Apr 29 13:31:02 EDT 2008 i686 athlon i386 GNU/Linux

Thanks,

Keaton