diff --git a/chainqueue/runnable/server.py b/chainqueue/runnable/server.py
index e92a2c6..968a587 100644
--- a/chainqueue/runnable/server.py
+++ b/chainqueue/runnable/server.py
@@ -76,7 +76,7 @@ class SessionController:
         self.srv = socket.socket(family=socket.AF_UNIX, type=socket.SOCK_STREAM)
         self.srv.bind(config.get('SESSION_SOCKET_PATH'))
         self.srv.listen(2)
-        self.srv.settimeout(1.0)
+        self.srv.settimeout(4.0)
 
     def shutdown(self, signo, frame):
         if self.dead:
@@ -111,11 +111,14 @@ adapter = EthAdapter(backend)
 rpc = EthHTTPConnection(url=config.get('RPC_ENDPOINT'), chain_spec=chain_spec)
 
 if __name__ == '__main__':
+    havesends = 0
     while True:
         srvs = None
         try:
+            logg.debug('getting connection')
             (srvs, srvs_addr) = ctrl.get_connection()
         except OSError as e:
+            havesends = 0
             try:
                 fi = os.stat(config.get('SESSION_SOCKET_PATH'))
             except FileNotFoundError:
@@ -125,16 +128,38 @@ if __name__ == '__main__':
                 logg.error('entity on socket path is not a socket')
                 break
             if srvs == None:
+                logg.debug('timeout (remote socket is none)')
                 txs = adapter.upcoming(chain_spec)
                 for k in txs.keys():
+                    havesends += 1
                     logg.debug('txs {} {}'.format(k, txs[k]))
                     adapter.dispatch(chain_spec, rpc, k, txs[k])
+                if havesends > 0:
+                    ctrl.srv.settimeout(0.1)
+                else:
+                    ctrl.srv.settimeout(4.0)
                 continue
-        srvs.setblocking(False)
-        data_in = srvs.recv(1024)
-        data_in_str = data_in.decode('utf-8')
-        data = bytes.fromhex(strip_0x(data_in_str))
-        r = adapter.add(chain_spec, data)
-        srvs.send(r.to_bytes(4, byteorder='big'))
+        ctrl.srv.settimeout(0.1)
+        srvs.settimeout(0.1)
+        data_in = None
+        try:
+            data_in = srvs.recv(1024)
+        except BlockingIOError as e:
+            logg.debug('block io error: {}'.format(e))
+            continue
 
-    ctrl.shutdown(None, None)
+        data = None
+        try:
+            data_in_str = data_in.decode('utf-8')
+            data = bytes.fromhex(strip_0x(data_in_str))
+        except ValueError:
+            logg.error('invalid input "{}"'.format(data_in_str))
+            continue
+
+        logg.debug('recv {} bytes'.format(len(data)))
+        r = adapter.add(chain_spec, data)
+        r = srvs.send(r.to_bytes(4, byteorder='big'))
+        logg.debug('{} bytes sent'.format(r))
+        srvs.close()
+
+ctrl.shutdown(None, None)