diff --git a/dbproxy/mongo/sessionmgr.go b/dbproxy/mongo/sessionmgr.go
index d2f3166..1e0b34e 100644
--- a/dbproxy/mongo/sessionmgr.go
+++ b/dbproxy/mongo/sessionmgr.go
@@ -240,7 +240,7 @@ func (msm *MgoSessionMgr) GetPltMgoSession(plt, key string) *Session {
 	if c, ok := msm.GetCfg(plt, key); ok {
 		s, err := newMgoSession(c.Username, c.Password, c.HostName, c.HostPort, c.Options)
 		if s == nil || err != nil {
-			logger.Logger.Error("GetPltMgoSession(%s,%s) err:%v", plt, key, err)
+			logger.Logger.Errorf("GetPltMgoSession(%s,%s) err:%v config:%+v", plt, key, err, *c)
 			return nil
 		}
 		ss := &Session{Session: s, cfg: c}