diff --git a/checker/checker.go b/checker/checker.go
index 08ba965..4cae4aa 100644
--- a/checker/checker.go
+++ b/checker/checker.go
@@ -46,7 +46,7 @@ func check_ping(ip string, cb func(pkt *ping.Packet)) (err error) {
 	pinger.Count = 1
 	pinger.OnRecv = cb
 	pinger.SetPrivileged(true)
-	err = pinger.Run()
+	pinger.Run()
 
 	return
 }
@@ -336,7 +336,7 @@ func check_dnssec(domain, ip string) (err error) {
 
 	if !found {
 		if err == nil {
-			return fmt.Errorf("Unable to find a valid DS record in parent zone (if you use your own domain (ie. not given by maatma), this can be due to a previously cached response, you should wait).")
+			return fmt.Errorf("Unable to find a valid DS record in parent zone.")
 		} else {
 			return err
 		}
@@ -560,23 +560,13 @@ func minTunnelVersion(std *adlin.Student, suffixip int) (int, error) {
 	return minversion, nil
 }
 
-func studentChecker(std *adlin.Student, also_check_matrix bool, offline bool) {
+func studentChecker(std *adlin.Student, also_check_matrix bool) {
 	tuns, err := std.GetActivesTunnels()
 	if err != nil {
-		if offline {
-			tuns, err = std.GetDefaultTunnels()
-			if err != nil {
-				if verbose {
-					log.Printf("SKip %s as I'm unable to generate default tunnels: %s", std.Login, err.Error())
-				}
-				return
-			}
-		} else {
-			if verbose2 {
-				log.Printf("SKip %s due to error when getting active tunnels: %s", std.Login, err.Error())
-			}
-			return
+		if verbose2 {
+			log.Printf("SKip %s due to error when getting active tunnels: %s", std.Login, err.Error())
 		}
+		return
 	}
 	if verbose2 && len(tuns) == 0 {
 		log.Printf("%s has no active tunnels: %s", std.Login, err.Error())
@@ -588,14 +578,14 @@ func studentChecker(std *adlin.Student, also_check_matrix bool, offline bool) {
 			log.Printf("Tests %s on %s...", std.Login, stdIP)
 		}
 		// Check ping
-		err = check_ping(stdIP, func(pkt *ping.Packet) {
+		check_ping(stdIP, func(pkt *ping.Packet) {
 			tunnel_version, err := minTunnelVersion(std, tun.SuffixIP)
 			if verbose {
 				log.Printf("%s PONG (on %x); version=%d (%v)\n", std.Login, tun.SuffixIP, tunnel_version, err)
 			}
 			std.OnPong(true)
 
-			if !offline && (tunnel_version == 2147483647 || tunnel_version == 0) {
+			if tunnel_version == 2147483647 || tunnel_version == 0 {
 				log.Printf("%s unknown tunnel version: %d skipping tests (%v)", std.Login, tunnel_version, err)
 				return
 			}
@@ -813,13 +803,11 @@ func studentChecker(std *adlin.Student, also_check_matrix bool, offline bool) {
 
 			return
 		})
-		if err != nil && verbose {
-			log.Printf("%s: Unable to perform ping to %s: %s", std.Login, stdIP, err.Error())
-		}
 	}
+
 }
 
-func studentsChecker(offline bool) {
+func studentsChecker() {
 	students, err := adlin.GetStudents()
 	if err != nil {
 		log.Println("Unable to check students:", err)
@@ -831,6 +819,6 @@ func studentsChecker(offline bool) {
 
 	for istd, s := range students {
 		time.Sleep(250 * time.Millisecond)
-		go studentChecker(s, istd%10 == check_matrix_for, offline)
+		go studentChecker(s, istd%10 == check_matrix_for)
 	}
 }
diff --git a/checker/main.go b/checker/main.go
index 95fda64..5663cc2 100644
--- a/checker/main.go
+++ b/checker/main.go
@@ -12,12 +12,9 @@ import (
 )
 
 func main() {
-	offline := false
-
 	var dsn = flag.String("dsn", adlin.DSNGenerator(), "DSN to connect to the MySQL server")
 	flag.BoolVar(&verbose, "verbose", verbose, "Enable verbose mode")
 	flag.BoolVar(&verbose2, "verbose2", verbose2, "Enable more verbose mode")
-	flag.BoolVar(&offline, "offline", offline, "Enable offline mode (doesn't check what wg report)")
 	flag.Parse()
 
 	if verbose2 && !verbose {
@@ -47,7 +44,7 @@ func main() {
 				log.Printf("%s: %s", std_login, err.Error())
 			} else {
 				log.Printf("Checking %s...", std.Login)
-				studentChecker(std, true, offline)
+				studentChecker(std, true)
 			}
 		}
 
@@ -62,14 +59,14 @@ func main() {
 	defer ticker.Stop()
 
 	// Launch checker
-	studentsChecker(offline)
+	studentsChecker()
 loop:
 	for {
 		select {
 		case <-interrupt:
 			break loop
 		case <-ticker.C:
-			studentsChecker(offline)
+			studentsChecker()
 		}
 	}
 }
diff --git a/libadlin/tunnel.go b/libadlin/tunnel.go
index 58a31fa..c4fa99c 100644
--- a/libadlin/tunnel.go
+++ b/libadlin/tunnel.go
@@ -225,13 +225,6 @@ func (student *Student) GetActivesTunnels() (ts []*TunnelToken, err error) {
 	}
 }
 
-func (student *Student) GetDefaultTunnels() (ts []*TunnelToken, err error) {
-	t := &TunnelToken{IdStudent: student.Id}
-	ts = append(ts, t)
-
-	return
-}
-
 func (student *Student) GetActivesTunnelsPubKey() (ts []ed25519.PublicKey, err error) {
 	var activeTuns []*TunnelToken
 	activeTuns, err = student.GetActivesTunnels()