diff --git a/.gitea/workflows/docker.yaml b/.gitea/workflows/docker.yaml
index 67e13d01..88660471 100644
--- a/.gitea/workflows/docker.yaml
+++ b/.gitea/workflows/docker.yaml
@@ -13,6 +13,19 @@ jobs:
       - name: Clone Repository
         uses: actions/checkout@v4
 
+
+      - name: Debug DNS + TLS from runner
+        run: |
+          set -x
+          getent hosts docker.srsoftware.de || true
+          dig +short docker.srsoftware.de || true
+
+      - name: Debug certificate (runner)
+        run: |
+          set -x
+          echo | openssl s_client -connect docker.srsoftware.de:443 -servername docker.srsoftware.de 2>/dev/null \
+            | openssl x509 -noout -subject -issuer -ext subjectAltName
+	    
       - name: Login to registry
         uses: docker/login-action@v2
         with: