diff --git a/dtls/demux/__init__.py b/dtls/demux/__init__.py
index 4c88f1a..ee53ba6 100644
--- a/dtls/demux/__init__.py
+++ b/dtls/demux/__init__.py
@@ -21,6 +21,7 @@ import sys
 if sys.platform.startswith('win') or sys.platform.startswith('cygwin'):
     from router import UDPDemux
 else:
-    from osnet import UDPDemux
+    #from osnet import UDPDemux
+    from router import UDPDemux
 
 __all__ = ["UDPDemux"]
diff --git a/dtls/openssl.py b/dtls/openssl.py
index 519d587..0c63d1f 100644
--- a/dtls/openssl.py
+++ b/dtls/openssl.py
@@ -616,9 +616,9 @@ def SSL_CTX_set_read_ahead(ctx, m):
     # Returns the previous value of m
     _SSL_CTX_ctrl(ctx, SSL_CTRL_SET_READ_AHEAD, m, None)
 
-_rint_voidp_ubytep_uintp = CFUNCTYPE(c_int, c_void_p, POINTER(c_ubyte),
+_rint_voidp_ubytep_uintp = CFUNCTYPE(c_int, c_int, POINTER(c_ubyte),
                                      POINTER(c_uint))
-_rint_voidp_ubytep_uint = CFUNCTYPE(c_int, c_void_p, POINTER(c_ubyte), c_uint)
+_rint_voidp_ubytep_uint = CFUNCTYPE(c_int, c_int, POINTER(c_ubyte), c_uint)
 
 def SSL_CTX_set_cookie_cb(ctx, generate, verify):
     def py_generate_cookie_cb(ssl, cookie, cookie_len):
diff --git a/dtls/test/unit.py b/dtls/test/unit.py
index b585889..8cedc39 100644
--- a/dtls/test/unit.py
+++ b/dtls/test/unit.py
@@ -154,10 +154,14 @@ class BasicSocketTests(unittest.TestCase):
         # something unexpected like TypeError.
         s = socket.socket(AF_INET4_6, socket.SOCK_DGRAM)
         ss = ssl.wrap_socket(s)
-        self.assertRaises(socket.error, ss.recv, 1)
-        self.assertRaises(socket.error, ss.recv_into, bytearray(b'x'))
-        self.assertRaises(socket.error, ss.recvfrom, 1)
-        self.assertRaises(socket.error, ss.recvfrom_into, bytearray(b'x'), 1)
+        if os.name != "posix":
+            # On Linux, unconnected, unbound datagram sockets can receive and
+            # the following calls will therefore block
+            self.assertRaises(socket.error, ss.recv, 1)
+            self.assertRaises(socket.error, ss.recv_into, bytearray(b'x'))
+            self.assertRaises(socket.error, ss.recvfrom, 1)
+            self.assertRaises(socket.error, ss.recvfrom_into, bytearray(b'x'),
+                              1)
         self.assertRaises(socket.error, ss.send, b'x')
         self.assertRaises(socket.error, ss.sendto, b'x',
                           ('0.0.0.0', 0) if AF_INET4_6 == socket.AF_INET else