diff --git a/src/fe-common/irc/fe-events-numeric.c b/src/fe-common/irc/fe-events-numeric.c
index 4c365a51..88775eb1 100644
--- a/src/fe-common/irc/fe-events-numeric.c
+++ b/src/fe-common/irc/fe-events-numeric.c
@@ -587,6 +587,26 @@ static void event_too_many_channels(const char *data, IRC_SERVER_REC *server)
 	cannot_join(data, server, IRCTXT_JOINERROR_TOOMANY);
 }
 
+static void event_duplicate_channel(const char *data, IRC_SERVER_REC *server)
+{
+	char *params, *channel, *p;
+
+	g_return_if_fail(data != NULL);
+
+	/* this new addition to ircd breaks completely with older
+	   "standards", "nick Duplicate ::!!channel ...." */
+	params = event_get_params(data, 3, NULL, NULL, &channel);
+	p = strchr(channel, ' ');
+	if (p != NULL) *p = '\0';
+
+	if (channel[0] == '!' && channel[1] == '!') {
+		printformat(server, NULL, MSGLEVEL_CRAP,
+			    IRCTXT_JOINERROR_DUPLICATE, channel+1);
+	}
+
+	g_free(params);
+}
+
 static void event_channel_is_full(const char *data, IRC_SERVER_REC *server)
 {
 	cannot_join(data, server, IRCTXT_JOINERROR_FULL);
@@ -710,6 +730,7 @@ void fe_events_numeric_init(void)
 	signal_add("event 401", (SIGNAL_FUNC) event_no_such_nick);
 	signal_add("event 403", (SIGNAL_FUNC) event_no_such_channel);
 	signal_add("event 405", (SIGNAL_FUNC) event_too_many_channels);
+	signal_add("event 407", (SIGNAL_FUNC) event_duplicate_channel);
 	signal_add("event 471", (SIGNAL_FUNC) event_channel_is_full);
 	signal_add("event 472", (SIGNAL_FUNC) event_unknown_mode);
 	signal_add("event 473", (SIGNAL_FUNC) event_invite_only);
@@ -768,6 +789,7 @@ void fe_events_numeric_deinit(void)
 	signal_remove("event 401", (SIGNAL_FUNC) event_no_such_nick);
 	signal_remove("event 403", (SIGNAL_FUNC) event_no_such_channel);
 	signal_remove("event 405", (SIGNAL_FUNC) event_too_many_channels);
+	signal_remove("event 407", (SIGNAL_FUNC) event_duplicate_channel);
 	signal_remove("event 471", (SIGNAL_FUNC) event_channel_is_full);
 	signal_remove("event 472", (SIGNAL_FUNC) event_unknown_mode);
 	signal_remove("event 473", (SIGNAL_FUNC) event_invite_only);
diff --git a/src/fe-common/irc/module-formats.c b/src/fe-common/irc/module-formats.c
index 4b193840..e9d41684 100644
--- a/src/fe-common/irc/module-formats.c
+++ b/src/fe-common/irc/module-formats.c
@@ -55,6 +55,7 @@ FORMAT_REC fecommon_irc_formats[] = {
 	{ "joinerror_bad_key", "Cannot join to channel %_$0%_ %K(%nBad channel key%K)", 1, { 0 } },
 	{ "joinerror_bad_mask", "Cannot join to channel %_$0%_ %K(%nBad channel mask%K)", 1, { 0 } },
 	{ "joinerror_unavail", "Cannot join to channel %_$0%_ %K(%nChannel is temporarily unavailable%K)", 1, { 0 } },
+	{ "joinerror_duplicate", "Channel %_$0%_ already exists - cannot create it", 1, { 0 } },
 	{ "channel_rejoin", "Channel %_$0%_ is temporarily unavailable, this is normally because of netsplits. Irssi will now automatically try to rejoin to this channel until the join is successfull. Use /RMREJOINS command if you wish to abort this.", 1, { 0 } },
 	{ "inviting", "Inviting $0 to %_$1", 2, { 0, 0 } },
 	{ "not_invited", "You have not been invited to a channel!", 0 },
diff --git a/src/fe-common/irc/module-formats.h b/src/fe-common/irc/module-formats.h
index 75e84a4b..88980328 100644
--- a/src/fe-common/irc/module-formats.h
+++ b/src/fe-common/irc/module-formats.h
@@ -32,6 +32,7 @@ enum {
 	IRCTXT_JOINERROR_BAD_KEY,
 	IRCTXT_JOINERROR_BAD_MASK,
 	IRCTXT_JOINERROR_UNAVAIL,
+	IRCTXT_JOINERROR_DUPLICATE,
 	IRCTXT_CHANNEL_REJOIN,
 	IRCTXT_INVITING,
 	IRCTXT_NOT_INVITED,
diff --git a/src/irc/core/channel-events.c b/src/irc/core/channel-events.c
index 936ca0e2..0fc43c5b 100644
--- a/src/irc/core/channel-events.c
+++ b/src/irc/core/channel-events.c
@@ -54,6 +54,30 @@ static void event_cannot_join(const char *data, IRC_SERVER_REC *server)
 	g_free(params);
 }
 
+static void event_duplicate_channel(const char *data, IRC_SERVER_REC *server)
+{
+	CHANNEL_REC *chanrec;
+	char *params, *channel, *p;
+
+	g_return_if_fail(data != NULL);
+
+	/* this new addition to ircd breaks completely with older
+	   "standards", "nick Duplicate ::!!channel ...." */
+	params = event_get_params(data, 3, NULL, NULL, &channel);
+	p = strchr(channel, ' ');
+	if (p != NULL) *p = '\0';
+
+	if (channel[0] == '!' && channel[1] == '!') {
+		chanrec = channel_find(SERVER(server), channel+1);
+		if (chanrec != NULL && !chanrec->names_got) {
+			chanrec->left = TRUE;
+			channel_destroy(chanrec);
+		}
+	}
+
+	g_free(params);
+}
+
 static void event_target_unavailable(const char *data, IRC_SERVER_REC *server)
 {
 	char *params, *channel;
@@ -246,7 +270,7 @@ void channel_events_init(void)
 {
 	signal_add_first("event 403", (SIGNAL_FUNC) event_cannot_join); /* no such channel */
 	signal_add_first("event 405", (SIGNAL_FUNC) event_cannot_join); /* too many channels */
-	signal_add_first("event 407", (SIGNAL_FUNC) event_cannot_join); /* duplicate channel */
+	signal_add_first("event 407", (SIGNAL_FUNC) event_duplicate_channel); /* duplicate channel */
 	signal_add_first("event 471", (SIGNAL_FUNC) event_cannot_join); /* channel is full */
 	signal_add_first("event 473", (SIGNAL_FUNC) event_cannot_join); /* invite only */
 	signal_add_first("event 474", (SIGNAL_FUNC) event_cannot_join); /* banned */
@@ -266,7 +290,7 @@ void channel_events_deinit(void)
 {
 	signal_remove("event 403", (SIGNAL_FUNC) event_cannot_join); /* no such channel */
 	signal_remove("event 405", (SIGNAL_FUNC) event_cannot_join); /* too many channels */
-	signal_remove("event 407", (SIGNAL_FUNC) event_cannot_join); /* duplicate channel */
+	signal_remove("event 407", (SIGNAL_FUNC) event_duplicate_channel); /* duplicate channel */
 	signal_remove("event 471", (SIGNAL_FUNC) event_cannot_join); /* channel is full */
 	signal_remove("event 473", (SIGNAL_FUNC) event_cannot_join); /* invite only */
 	signal_remove("event 474", (SIGNAL_FUNC) event_cannot_join); /* banned */