diff --git a/files/squid/helpers/rules.d/opendsa.rules b/files/squid/helpers/rules.d/opendsa.rules
index 724eedbdae57aef32333fb75a67ea981a419afd9..893734b0a01403d2f91b60e15b985d96e14c6511 100644
--- a/files/squid/helpers/rules.d/opendsa.rules
+++ b/files/squid/helpers/rules.d/opendsa.rules
@@ -1,7 +1,5 @@
 // OpenDSA
 
-// ^.* false
-
 ^https?://www\.ida\.liu\.se/edu/ugrad/datortenta/OpenDSA/Books/TDDD86_200317/.*  true
 
 ^https?://www\.ida\.liu\.se/edu/ugrad/datortenta/OpenDSA/Books/.*                false
diff --git a/files/squid/helpers/squid-url-rewrite.py b/files/squid/helpers/squid-url-rewrite.py
index c827c184d5513bfdf3af8c82031bc8a6cf94f165..92b01a7b9ba60c5e35dcc2b90103d890fe5a563b 100755
--- a/files/squid/helpers/squid-url-rewrite.py
+++ b/files/squid/helpers/squid-url-rewrite.py
@@ -74,6 +74,10 @@ def main():
     
     ruleset = list()
 
+    block_all = basedir + "/../BLOCK_ALL"
+    if os.path.isfile(block_all):
+        ruleset.append( ["^.*", False] )
+
     devel_rules = basedir + "/../devel.rules"
     if 'devel' in hostname and os.path.isfile(devel_rules):
         load_rules(ruleset, devel_rules)