diff --git a/backend/bdd/features/steps/pki_acme.py b/backend/bdd/features/steps/pki_acme.py
index c5627bb8b..02074f92c 100644
--- a/backend/bdd/features/steps/pki_acme.py
+++ b/backend/bdd/features/steps/pki_acme.py
@@ -350,15 +350,14 @@ def step_impl(context: Context, var_path: str, hostname: str):
     if hostname != "localhost":
         raise ValueError("Currently only localhost is supported")
     challenge = eval_var(context, var_path, as_json=False)
-    acme_challenge = challenge.chall
-    response, validation = acme_challenge.response_and_validation(
+    response, validation = challenge.response_and_validation(
         context.acme_client.net.key
     )
     resource = standalone.HTTP01RequestHandler.HTTP01Resource(
-        chall=acme_challenge, response=response, validation=validation
+        chall=challenge, response=response, validation=validation
     )
     # TODO: make port configurable
-    servers = standalone.HTTP01DualNetworkedServers(("", 8087), resource)
+    servers = standalone.HTTP01DualNetworkedServers(("0.0.0.0", 8087), resource)
     # Start client standalone web server.
     web_server = threading.Thread(name="web_server", target=servers.serve_forever)
     web_server.daemon = True
diff --git a/backend/src/ee/services/pki-acme/pki-acme-service.ts b/backend/src/ee/services/pki-acme/pki-acme-service.ts
index d6cf92a48..f1d60b241 100644
--- a/backend/src/ee/services/pki-acme/pki-acme-service.ts
+++ b/backend/src/ee/services/pki-acme/pki-acme-service.ts
@@ -413,7 +413,7 @@ export const pkiAcmeServiceFactory = ({
                 // RFC 8555 suggests a token with at least 128 bits of entropy
                 // We are using 256 bits of entropy here, should be enough for now
                 // ref: https://datatracker.ietf.org/doc/html/rfc8555#section-11.3
-                token: crypto.randomBytes(32).toString("base64"),
+                token: crypto.randomBytes(32).toString("base64url"),
                 // TODO: read config from the profile to get the expiration time instead
                 expiresAt: new Date(Date.now() + 24 * 60 * 60 * 1000)
               },