cubicweb #3811040 permanent connection loss seem to occur after one bad event [open]

Traceback (most recent call last):
 File "\\nl1grp1.melinda.local\PYL001A\Labo\Pegase\cubicweb\server\sources\", line 860, in _eid_type_source
   res = self.doexec(session, sql).fetchone()
 File "\\nl1grp1.melinda.local\PYL001A\Labo\Pegase\cubicweb\server\sources\", line 743, in doexec
   cursor.execute(str(query), args)
 File "\\nl1grp1.melinda.local\PYL001A\Labo\Pegase\logilab\database\", line 109, in execute
Error: ('08S01', '[08S01] [Microsoft][SQL Server Native Client 10.0]Communication link failure (0) (SQLExecDirectW)')
2014-05-06 13:47:00 - (cubicweb.sources.system) CRITICAL: sql: 'SELECT _W.cw_eid\nFROM cw_CWWorker AS _W\nWHERE _W.cw_last_ping<%(tstamp)s'

After the first one, it doesn't get better. I'm still waiting for some on-site details.

done in<not specified>
closed by<not specified>