diff --git a/src/server.py b/src/server.py
--- a/src/server.py
+++ b/src/server.py
@@ -6,6 +6,7 @@ import logging as log
 from hashtree import hashBlock
 from netnode import BaseConnection,NetNode
 import config as conf
+import status
 
 
 class Connection(BaseConnection):
@@ -40,7 +41,7 @@ class Miniserver:
 				if p and p.is_alive():
 					with connection as c:
 						c[0].readMsg()
-						c[1].writeMsg({"command":"deny"})
+						c[1].writeMsg({"command":"deny","status":status.locked})
 					continue
 				p=multiprocessing.Process(target=Server.run,args=(connection,self._filename,self._treeFile))
 				p.start()
@@ -79,9 +80,11 @@ class Server(NetNode):
 
 		if jsonData["command"]=="init":
 			if jsonData["blockSize"]!=self.BLOCK_SIZE or jsonData["blockCount"]!=self._tree.leafCount:
-				self._outcoming.writeMsg({"command":"deny"})
+				self._outcoming.writeMsg({"command":"deny","status":status.incompatible.parameters})
+			if jsonData["version"]<conf.lowestCompatible:
+				self._outcoming.writeMsg({"command":"deny","status":status.incompatible.version})
 			if jsonData["action"]=="pull" and self.isLocked():
-				self._outcoming.writeMsg({"command":"deny"})
+				self._outcoming.writeMsg({"command":"deny","status":status.locked})
 			if jsonData["action"]=="push" and not self.isLocked():
 				self._lock()