--- univention-radius-ntlm-auth	2016-10-20 15:10:28.386197204 +0200
+++ univention-radius-ntlm-auth.fixed	2016-10-20 15:10:12.906000559 +0200
@@ -37,6 +37,7 @@
 import sys
 import univention.pyMsChapV2 as pyMsChapV2
 import univention.uldap
+import re
 from ldap import SERVER_DOWN
 
 
@@ -64,8 +65,7 @@
 		stationId = None
 	else:
 		# safely decode station id (fails with exception on mis-formatted id, thus returning 1)
-		stationId = options.stationId
-		stationId = stationId[0:2] + stationId[3:5] + stationId[6:8] + stationId[9:11] + stationId[12:14] + stationId[15:17]
+		stationId = re.sub('[^0-9a-f]', '', options.stationId)
 		stationId = stationId.decode('hex')
 	options.Challenge = options.Challenge.decode('hex')
 	options.Response = options.Response.decode('hex')