diff --git a/plugins/Sidebar/SidebarPlugin.py b/plugins/Sidebar/SidebarPlugin.py
index da14e920..4aa8f4b3 100644
--- a/plugins/Sidebar/SidebarPlugin.py
+++ b/plugins/Sidebar/SidebarPlugin.py
@@ -98,7 +98,7 @@ class UiWebsocketPlugin(object):
         # Add myself
         if site.settings["serving"]:
             peers_total += 1
-            if site.connection_server.port_opened:
+            if any(site.connection_server.port_opened.values()):
                 connectable += 1
             if site.connection_server.tor_manager.start_onions:
                 onion += 1
diff --git a/src/Connection/Connection.py b/src/Connection/Connection.py
index 25956698..494de85a 100644
--- a/src/Connection/Connection.py
+++ b/src/Connection/Connection.py
@@ -347,7 +347,7 @@ class Connection(object):
             "protocol": "v2",
             "peer_id": peer_id,
             "fileserver_port": self.server.port,
-            "port_opened": self.server.port_opened,
+            "port_opened": self.server.port_opened.get(self.ip_type, None),
             "target_ip": self.ip,
             "rev": config.rev,
             "crypt_supported": crypt_supported,
diff --git a/src/Connection/ConnectionServer.py b/src/Connection/ConnectionServer.py
index 308cde2b..60752029 100644
--- a/src/Connection/ConnectionServer.py
+++ b/src/Connection/ConnectionServer.py
@@ -164,7 +164,9 @@ class ConnectionServer(object):
         pass
 
     def getConnection(self, ip=None, port=None, peer_id=None, create=True, site=None, is_tracker_connection=False):
-        if (ip.endswith(".onion") or self.port_opened == False) and self.tor_manager.start_onions and site:  # Site-unique connection for Tor
+        ip_type = helper.getIpType(ip)
+        has_per_site_onion = (ip.endswith(".onion") or self.port_opened.get(ip_type, None) == False) and self.tor_manager.start_onions and site
+        if has_per_site_onion:  # Site-unique connection for Tor
             if ip.endswith(".onion"):
                 site_onion = self.tor_manager.getOnion(site.address)
             else:
@@ -206,7 +208,7 @@ class ConnectionServer(object):
                 raise Exception("This peer is blacklisted")
 
             try:
-                if (ip.endswith(".onion") or self.port_opened == False) and self.tor_manager.start_onions and site:  # Lock connection to site
+                if has_per_site_onion:  # Lock connection to site
                     connection = Connection(self, ip, port, target_onion=site_onion, is_tracker_connection=is_tracker_connection)
                 else:
                     connection = Connection(self, ip, port, is_tracker_connection=is_tracker_connection)
diff --git a/src/File/FileServer.py b/src/File/FileServer.py
index 76b10953..a6fe51e8 100644
--- a/src/File/FileServer.py
+++ b/src/File/FileServer.py
@@ -42,8 +42,11 @@ class FileServer(ConnectionServer):
 
         ConnectionServer.__init__(self, ip, port, self.handleRequest)
 
+
+        self.port_opened = {}
+
         if config.ip_external:  # Ip external defined in arguments
-            self.port_opened = True
+            self.port_opened[helper.getIpType(config.ip_external)] = True
             SiteManager.peer_blacklist.append((config.ip_external, self.port))  # Add myself to peer blacklist
         else:
             self.port_opened = None  # Check it later
@@ -108,23 +111,47 @@ class FileServer(ConnectionServer):
         self.port_opened = True
 
     def portCheck(self):
-        res = self.portchecker.portCheck(self.port, helper.getIpType(self.ip))
-        if not res["opened"]:
-            if self.portchecker.portOpen(self.port):
-                res = self.portchecker.portCheck(self.port, helper.getIpType(self.ip))
+        self.port_opened = {}
+        if self.ui_server:
+            self.ui_server.updateWebsocket()
 
-        if res["ip"]:
-            config.ip_external = res["ip"]
-            SiteManager.peer_blacklist.append((config.ip_external, self.port))  # Add myself to peer blacklist
+        if "ipv6" in self.supported_ip_types:
+            res_ipv6_thread = gevent.spawn(self.portchecker.portCheck, self.port, "ipv6")
+        else:
+            res_ipv6_thread = None
+
+        res_ipv4 = self.portchecker.portCheck(self.port, "ipv4")
+        if not res_ipv4["opened"]:
+            if self.portchecker.portOpen(self.port):
+                res_ipv4 = self.portchecker.portCheck(self.port, "ipv4")
+
+        if res_ipv6_thread == None:
+            res_ipv6 = {"ip": None, "opened": None}
+        else:
+            res_ipv6 = res_ipv6_thread.get()
+            if res_ipv6["opened"] and not helper.getIpType(res_ipv6["ip"]) == "ipv6":
+                self.log.info("Invalid IPv6 address from port check: %s" % res_ipv6["ip"])
+                res_ipv6["opened"] = False
+
+        if res_ipv4["ip"]:
+            config.ip_external = res_ipv4["ip"]
+            SiteManager.peer_blacklist.append((res_ipv4["ip"], self.port))
         else:
             config.ip_external = False
 
-        if res["opened"]:
-            self.log.info("Server port on %s:%s: Open" % (self.ip, self.port))
-            return True
-        else:
-            self.log.info("Server port on %s:%s: Closed" % (self.ip, self.port))
-            return False
+        if res_ipv6["ip"]:
+            SiteManager.peer_blacklist.append((res_ipv6["ip"], self.port))
+
+        self.log.info("Server port opened ipv4: %s, ipv6: %s" % (res_ipv4["opened"], res_ipv6["opened"]))
+
+
+        res = {"ipv4": res_ipv4["opened"], "ipv6": res_ipv6["opened"]}
+        self.port_opened.update(res)
+
+        if self.ui_server:
+            self.ui_server.updateWebsocket()
+
+        return res
 
     # Check site file integrity
     def checkSite(self, site, check_files=False):
@@ -140,18 +167,15 @@ class FileServer(ConnectionServer):
         self.log.debug("Checking sites...")
         s = time.time()
         sites_checking = False
-        if self.port_opened is None or force_port_check:  # Test and open port if not tested yet
+        if not self.port_opened or force_port_check:  # Test and open port if not tested yet
             if len(self.sites) <= 2:  # Don't wait port opening on first startup
                 sites_checking = True
                 for address, site in self.sites.items():
                     gevent.spawn(self.checkSite, site, check_files)
 
-            if force_port_check:
-                self.port_opened = None
+            self.portCheck()
 
-            self.port_opened = self.portCheck()
-
-            if self.port_opened is False:
+            if not self.port_opened["ipv4"]:
                 self.tor_manager.startOnions()
 
         if not sites_checking:
diff --git a/src/Peer/PeerPortchecker.py b/src/Peer/PeerPortchecker.py
index dacab209..232b2523 100644
--- a/src/Peer/PeerPortchecker.py
+++ b/src/Peer/PeerPortchecker.py
@@ -31,11 +31,7 @@ class PeerPortchecker(object):
             self.log.warning("UpnpPunch run error: %s" % Debug.formatException(err))
             return False
 
-        if self.portCheck(port)["opened"]:
-            return True
-        else:
-            self.log.info("Upnp mapping failed, please forward port %s on your router to your ipaddress" % port)
-            return False
+        return True
 
     def portClose(self, port):
         return UpnpPunch.ask_to_close_port(port, protos=["TCP"])
diff --git a/src/Site/SiteAnnouncer.py b/src/Site/SiteAnnouncer.py
index caf9f2e5..89a7314d 100644
--- a/src/Site/SiteAnnouncer.py
+++ b/src/Site/SiteAnnouncer.py
@@ -68,8 +68,10 @@ class SiteAnnouncer(object):
     def getOpenedServiceTypes(self):
         back = []
         # Type of addresses they can reach me
-        if self.site.connection_server.port_opened and config.trackers_proxy == "disable":
-            back.append(helper.getIpType(self.site.connection_server.ip))
+        if config.trackers_proxy == "disable":
+            for ip_type, opened in self.site.connection_server.port_opened.items():
+                if opened:
+                    back.append(ip_type)
         if self.site.connection_server.tor_manager.start_onions:
             back.append("onion")
         return back
diff --git a/src/Ui/UiWebsocket.py b/src/Ui/UiWebsocket.py
index 6cc5f0c3..7fde790a 100644
--- a/src/Ui/UiWebsocket.py
+++ b/src/Ui/UiWebsocket.py
@@ -50,7 +50,7 @@ class UiWebsocket(object):
             # Add open fileserver port message or closed port error to homepage at first request after start
             self.site.page_requested = True  # Dont add connection notification anymore
             file_server = sys.modules["main"].file_server
-            if file_server.port_opened is None or file_server.tor_manager.start_onions is None:
+            if not file_server.port_opened or file_server.tor_manager.start_onions is None:
                 self.site.page_requested = False  # Not ready yet, check next time
             else:
                 try:
@@ -105,7 +105,7 @@ class UiWebsocket(object):
                 ])
 
         file_server = sys.modules["main"].file_server
-        if file_server.port_opened is True:
+        if any(file_server.port_opened.values()):
             self.site.notifications.append([
                 "done",
                 _["Congratulations, your port <b>{0}</b> is opened.<br>You are a full member of the ZeroNet network!"].format(config.fileserver_port),
@@ -129,7 +129,7 @@ class UiWebsocket(object):
                 """),
                 0
             ])
-        elif file_server.port_opened is False and file_server.tor_manager.start_onions:
+        elif file_server.tor_manager.start_onions:
             self.site.notifications.append([
                 "done",
                 _(u"""
@@ -318,8 +318,13 @@ class UiWebsocket(object):
 
     def formatServerInfo(self):
         file_server = sys.modules["main"].file_server
+        if file_server.port_opened == {}:
+            ip_external = None
+        else:
+            ip_external = any(file_server.port_opened.values())
         return {
-            "ip_external": file_server.port_opened,
+            "ip_external": ip_external,
+            "port_opened": file_server.port_opened,
             "platform": sys.platform,
             "fileserver_ip": config.fileserver_ip,
             "fileserver_port": config.fileserver_port,
@@ -534,7 +539,7 @@ class UiWebsocket(object):
                 self.response(to, "ok")
         else:
             if len(site.peers) == 0:
-                if sys.modules["main"].file_server.port_opened or sys.modules["main"].file_server.tor_manager.start_onions:
+                if any(sys.modules["main"].file_server.port_opened.values()) or sys.modules["main"].file_server.tor_manager.start_onions:
                     if notification:
                         self.cmd("notification", ["info", _["No peers found, but your content is ready to access."]])
                     if callback: