diff --git a/doc/configuration.txt b/doc/configuration.txt
index 77d309de4..74cd88098 100644
--- a/doc/configuration.txt
+++ b/doc/configuration.txt
@@ -5345,11 +5345,11 @@ All proxy names must be formed from upper and lower case letters, digits,
 '-' (dash), '_' (underscore) , '.' (dot) and ':' (colon). ACL names are
 case-sensitive, which means that "www" and "WWW" are two different proxies.
 
-Historically, all proxy names could overlap, it just caused troubles in the
-logs. Since the introduction of content switching, it is mandatory that two
-proxies with overlapping capabilities (frontend/backend) have different names.
-However, it is still permitted that a frontend and a backend share the same
-name, as this configuration seems to be commonly encountered.
+Historically, all proxy names could overlap when certain conditions were met
+(e.g. when not having the same frontend/backend capabilities), but it used to
+cause too many problems in the logs as well as confusion on CLI operations,
+stick-tables naming and stats retrieval. It is now mandatory that two proxies
+have different names, regardless of their respective capabilities.
 
 Right now, two major proxy modes are supported : "tcp", also known as layer 4,
 and "http", also known as layer 7. In layer 4 mode, HAProxy simply forwards
diff --git a/src/cfgparse-listen.c b/src/cfgparse-listen.c
index 2dd2a4897..31a911101 100644
--- a/src/cfgparse-listen.c
+++ b/src/cfgparse-listen.c
@@ -424,11 +424,12 @@ int cfg_parse_listen(const char *file, int linenum, char **args, int kwm)
 
 		if (curproxy) {
 			/* different capabilities but still same name: forbidden soon */
-			ha_warning("Parsing [%s:%d]: %s '%s' has the same name as %s '%s' declared at %s:%d."
-				   " This is dangerous and will not be supported anymore in version 3.3.\n",
+			ha_alert("Parsing [%s:%d]: %s '%s' has the same name as %s '%s' declared at %s:%d."
+				 " This is no longer supported as of 3.3. Please rename one or the other.\n",
 				   file, linenum, proxy_cap_str(rc), args[1], proxy_type_str(curproxy),
 				   curproxy->id, curproxy->conf.file, curproxy->conf.line);
-			err_code |= ERR_WARN;
+			err_code |= ERR_ALERT | ERR_ABORT;
+			goto out;
 		}
 
 		if (rc & PR_CAP_DEF && strcmp(args[1], "from") == 0 && *args[2] && !*args[3]) {