diff --git a/internal/firewalls/firewall_firewalld.go b/internal/firewalls/firewall_firewalld.go
index 6ec1a15..81146bc 100644
--- a/internal/firewalls/firewall_firewalld.go
+++ b/internal/firewalls/firewall_firewalld.go
@@ -170,7 +170,7 @@ func (this *Firewalld) DropSourceIP(ip string, timeoutSeconds int, async bool) e
 	}
 
 	// 避免短时间内重复添加
-	if this.checkLatestIP(ip) {
+	if async && this.checkLatestIP(ip) {
 		return nil
 	}
 
diff --git a/internal/firewalls/firewall_nftables.go b/internal/firewalls/firewall_nftables.go
index 33517a0..3632b39 100644
--- a/internal/firewalls/firewall_nftables.go
+++ b/internal/firewalls/firewall_nftables.go
@@ -347,14 +347,14 @@ func (this *NFTablesFirewall) DropSourceIP(ip string, timeoutSeconds int, async
 		return errors.New("invalid ip '" + ip + "'")
 	}
 
-	// 避免短时间内重复添加
-	if this.checkLatestIP(ip) {
-		return nil
-	}
-
 	// 尝试关闭连接
 	conns.SharedMap.CloseIPConns(ip)
 
+	// 避免短时间内重复添加
+	if async && this.checkLatestIP(ip) {
+		return nil
+	}
+
 	if async {
 		select {
 		case this.dropIPQueue <- &blockIPItem{