diff --git a/sat/core/xmpp.py b/sat/core/xmpp.py
index 58f764b1..0f69b718 100644
--- a/sat/core/xmpp.py
+++ b/sat/core/xmpp.py
@@ -56,8 +56,10 @@ NS_ROSTER_VER = "urn:xmpp:features:rosterver"
 ROSTER_VER_KEY = "@version@"
 
 
-class SatXMPPEntity(object):
+class SatXMPPEntity:
     """Common code for Client and Component"""
+    # profile is added there when startConnection begins and removed when it is finished
+    profiles_connecting = set()
 
     def __init__(self, host_app, profile, max_retries):
         factory = self.factory
@@ -154,6 +156,9 @@ class SatXMPPEntity(object):
         #        (e.g. adding subprotocols)
         #        but client should not be deleted except if session is finished
         #        (independently of connection/deconnection)
+        if profile in cls.profiles_connecting:
+            raise exceptions.CancelError(f"{profile} is already being connected")
+        cls.profiles_connecting.add(profile)
         try:
             port = int(
                 host.memory.getParamA(
@@ -169,9 +174,6 @@ class SatXMPPEntity(object):
         password = yield host.memory.asyncGetParamA(
             "Password", "Connection", profile_key=profile
         )
-        if profile in host.profiles:
-            raise exceptions.InternalError(
-                f"There is already a profile of name {profile} in host")
 
         entity_jid_s = yield host.memory.asyncGetParamA(
             "JabberID", "Connection", profile_key=profile)
@@ -195,6 +197,9 @@ class SatXMPPEntity(object):
                 resource=resource))
             entity_jid.resource = resource
 
+        if profile in host.profiles:
+            raise exceptions.InternalError(
+                f"There is already a profile of name {profile} in host")
         entity = host.profiles[profile] = cls(
             host, profile, entity_jid, password,
             host.memory.getParamA(C.FORCE_SERVER_PARAM, "Connection",
@@ -249,6 +254,8 @@ class SatXMPPEntity(object):
         )  # FIXME: we should have a timeout here, and a way to know if a plugin freeze
         # TODO: mesure launch time of each plugin
 
+        cls.profiles_connecting.remove(profile)
+
     def _disconnectionCb(self, __):
         self._connected_d = None
 
@@ -784,7 +791,11 @@ class SatXMPPClient(SatXMPPEntity, wokkel_client.XMPPClient):
     @classmethod
     @defer.inlineCallbacks
     def startConnection(cls, host, profile, max_retries):
-        yield super(SatXMPPClient, cls).startConnection(host, profile, max_retries)
+        try:
+            yield super(SatXMPPClient, cls).startConnection(host, profile, max_retries)
+        except exceptions.CancelError as e:
+            log.warning(f"startConnection cancelled: {e}")
+            return
         entity = host.profiles[profile]
         # we finally send our presence
         entity.presence.available()