diff --git a/nodes/htz-cloud/wireguard.py b/nodes/htz-cloud/wireguard.py
index 6c6c17a..42c187d 100644
--- a/nodes/htz-cloud/wireguard.py
+++ b/nodes/htz-cloud/wireguard.py
@@ -50,6 +50,10 @@ nodes['htz-cloud.wireguard'] = {
                 '50-wireguard': [
                     'udp dport 1194 accept',
                     'udp dport 51800 accept',
+
+                    # wg.c3voc.de
+                    'udp dport 51801 ip saddr 185.106.84.42 accept',
+                    'udp dport 51801 ip6 saddr 2001:67c:20a0:e::189 accept',
                 ],
             },
             'postrouting': {