tests: Allow closed http server in assert_start_raises_init_error

test/functional/test_framework/test_node.py

@@ -187,7 +187,9 @@ def wait_for_rpc_connection(self):
                 if e.errno != errno.ECONNREFUSED:  # Port not yet open?
                     raise  # unknown IO error
             except JSONRPCException as e:  # Initialization phase
-                if e.error['code'] != -28:  # RPC in warmup?
+                # -28 RPC in warmup
+                # -342 Service unavailable, RPC server started but is shutting down due to error
+                if e.error['code'] != -28 and e.error['code'] != -342:
                     raise  # unknown JSON RPC exception
             except ValueError as e:  # cookie file not found and no rpcuser or rpcassword. bitcoind still starting
                 if "No RPC credentials" not in str(e):