diff --git a/.travis.yml b/.travis.yml
index b2f1df929..b9752d16f 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -10,6 +10,7 @@ env:
   global:
     - ROS_PARALLEL_TEST_JOBS="-j1"
     - CATKIN_PARALLEL_TEST_JOBS="-p1"
+    - GIT_SSL_NO_VERIFY=1 # http://stackoverflow.com/questions/21181231/server-certificate-verification-failed-cafile-etc-ssl-certs-ca-certificates-c
   matrix:
     - ROS_DISTRO=hydro  ROSWS=wstool BUILDER=catkin   USE_DEB=true  ROS_PARALLEL_JOBS="-j2 -l2"
     - ROS_DISTRO=indigo ROSWS=wstool BUILDER=catkin   USE_DEB=true  ROS_PARALLEL_JOBS="-j8"
diff --git a/3rdparty/downward/CMakeLists.txt b/3rdparty/downward/CMakeLists.txt
index bb35667a6..fb56c1dd3 100644
--- a/3rdparty/downward/CMakeLists.txt
+++ b/3rdparty/downward/CMakeLists.txt
@@ -7,7 +7,7 @@ catkin_package()
 
 include(ExternalProject)
 externalproject_add(downward
-  URL https://cdn.rawgit.com/jsk-ros-pkg/archives/master/Fast-Downward-f33d3b65601f.tar.gz
+  URL http://cdn.rawgit.com/jsk-ros-pkg/archives/master/Fast-Downward-f33d3b65601f.tar.gz
   TIMEOUT 120
   CONFIGURE_COMMAND ""
   BUILD_COMMAND cd src && ./build_all DOWNWARD_BITWIDTH=native