diff --git a/lib/manager.js b/lib/manager.js
index 17912a8..57d5ddb 100644
--- a/lib/manager.js
+++ b/lib/manager.js
@@ -165,9 +165,6 @@ function managerRetry(self, id)
 	} else {
 		delete(self._requests[id]);
 		request.cb(1, {});
-
-		if (Object.keys(self._requests).length == 0)
-			self._dgram.close();
 	}
 }
 
@@ -196,9 +193,6 @@ function managerRecv(self, buf, peer)
 		nextBulkGet(self, options, msg.varBindList);
 		break;
 	}
-
-	if (Object.keys(self._requests).length == 0)
-		self._dgram.close();
 }
 
 /* API */
@@ -225,10 +219,14 @@ function Manager(options)
 	    function (err) { /* XXX */ });
 
 	this._dgram.bind(options.localport);
-	process.nextTick(function() {
-		if (Object.keys(self._requests).length == 0)
-			self._dgram.close();
-	});
+}
+
+Manager.prototype.close = function() {
+    try {
+        this._dgram.close();
+    } catch(e) {
+        // ?? I don't think we care
+    }
 }
 
 Manager.prototype.get = function (agent, oids, cb, options)
diff --git a/lib/messages/message.js b/lib/messages/message.js
index 6130a43..66f89ee 100644
--- a/lib/messages/message.js
+++ b/lib/messages/message.js
@@ -58,7 +58,7 @@ function parseInt(ber, tag)
 		value = value.shiftLeft(8).add(a);
 	}
 
-	return (fb & 0x80) ? value.mul(-1) : value;
+	return (fb & 0x80) ? value.subtract(BigInteger.valueOf(Math.pow(2,(buf.length*8)-1))) : value;
 }
 var intTypes = [ ASN1.Ber.Integer, 65, 66, 67, 70 ];
 for (var i = 0; i < intTypes.length; i++) {
diff --git a/package.json b/package.json
index dc5237c..20cbd19 100644
--- a/package.json
+++ b/package.json
@@ -2,7 +2,7 @@
   "author": "David Gwynne <david@gwynne.id.au>",
   "name": "snmp",
   "description": "SNMP APIs",
-  "version": "0.0.2",
+  "version": "0.0.3",
   "repository": {
     "type": "git",
     "url": "git://github.com/dgwynne/node-snmp.git"
@@ -12,7 +12,7 @@
     "lib": "./lib"
   },
   "engines": {
-    "node": ">=0.4"
+    "node": ">=0.6"
   },
   "dependencies": {
     "asn1": "0.1.11",