diff --git a/adminer/include/auth.inc.php b/adminer/include/auth.inc.php
index 964f1d90..67a59484 100644
--- a/adminer/include/auth.inc.php
+++ b/adminer/include/auth.inc.php
@@ -162,7 +162,7 @@ stop_session(true);
 
 if (isset($_GET["username"]) && is_string(get_password())) {
 	list($host, $port) = explode(":", SERVER, 2);
-	if (+$port && ($port < 1024 || $port > 65535)) {
+	if (preg_match('~^\s*([-+]?\d+)~', $port, $match) && ($match[1] < 1024 || $match[1] > 65535)) { // is_numeric('80#') would still connect to port 80
 		auth_error(lang('Connecting to privileged ports is not allowed.'));
 	}
 	check_invalid_login();
diff --git a/changes.txt b/changes.txt
index 2757183c..3efc970b 100644
--- a/changes.txt
+++ b/changes.txt
@@ -3,6 +3,7 @@ Fix XSS in browsers which don't encode URL parameters (bug #775, regression from
 Elasticsearch, ClickHouse: Do not print response if HTTP code is not 200
 Don't syntax highlight during IME composition (bug #747)
 MySQL: Do not export names in quotes with sql_mode='ANSI_QUOTES' (bug #749)
+MySQL: Avoid error in PHP 8 when connecting to socket (PR #409)
 PostgreSQL: Export all FKs after all CREATE TABLE (PR #351)
 PostgreSQL: Fix dollar-quoted syntax highlighting (bug #738)
 PostgreSQL: Do not show view definition from other schema (PR #392)