diff --git a/helpers/apt-download b/helpers/apt-download
index df6c578..5c53b6b 100644
--- a/helpers/apt-download
+++ b/helpers/apt-download
@@ -10,6 +10,7 @@ fi
 
 LOADED_APT_DOWNLOAD="yes"
 MAX_RETRY=${MAX_RETRY:-"3"}
+DOWNLOAD_TIMEOUT=${DOWNLOAD_TIMEOUT:-"1800"}
 
 function apt-download-binary() {
 	local base_url=$1
@@ -154,8 +155,9 @@ function apt-download-binary() {
 		for retry in `seq ${MAX_RETRY}`; do
 			echo "downloading ${pkg_url} to ${dest_filename}"
 			if [[ -z ${APT_DRY_RUN:-} ]]; then
-				wget ${WGET_OPTIONS:-} -q -O ${dest_filename} ${pkg_url} && {
-					echo "${pkg_checksum}  ${dest_filename}" | ${checksum_cmd} -c - && downloaded=true # two space for md5sum/sha1sum/sha256sum check format
+				timeout -s INT "$DOWNLOAD_TIMEOUT" wget ${WGET_OPTIONS:-} -q -O ${dest_filename} ${pkg_url} && {
+					# two space for md5sum/sha1sum/sha256sum check format
+					echo "${pkg_checksum}  ${dest_filename}" | ${checksum_cmd} -c - && downloaded=true
 				}
 			else
 				downloaded=true
diff --git a/virtualbox.sh b/virtualbox.sh
index b08e5a8..8c5644f 100755
--- a/virtualbox.sh
+++ b/virtualbox.sh
@@ -8,6 +8,8 @@ _here=`dirname $(realpath $0)`
 
 [[ -z "${LOADED_APT_DOWNLOAD}" ]] && { echo "failed to load apt-download"; exit 1; }
 
+MAX_RETRY=${MAX_RETRY:-"3"}
+DOWNLOAD_TIMEOUT=${DOWNLOAD_TIMEOUT:-"1800"}
 
 BASE_URL="http://download.virtualbox.org/virtualbox"
 BASE_PATH="${TUNASYNC_WORKING_DIR}"
@@ -63,13 +65,13 @@ echo "Debian and ubuntu finished"
 
 # === download standalone packages ====
 
-timeout -s INT 300 wget ${WGET_OPTIONS:-} -q -O "${BASE_PATH}/LATEST.TXT" "${BASE_URL}/LATEST.TXT"
+timeout -s INT 30 wget ${WGET_OPTIONS:-} -q -O "${BASE_PATH}/LATEST.TXT" "${BASE_URL}/LATEST.TXT"
 LATEST_VERSION=`cat "${BASE_PATH}/LATEST.TXT"`
 LATEST_PATH="${BASE_PATH}/${LATEST_VERSION}"
 
 mkdir -p ${LATEST_PATH}
-timeout -s INT 300 wget ${WGET_OPTIONS:-} -q -O "${LATEST_PATH}/MD5SUMS" "${BASE_URL}/${LATEST_VERSION}/MD5SUMS"
-timeout -s INT 300 wget ${WGET_OPTIONS:-} -q -O "${LATEST_PATH}/SHA256SUMS" "${BASE_URL}/${LATEST_VERSION}/SHA256SUMS"
+timeout -s INT 30 wget ${WGET_OPTIONS:-} -q -O "${LATEST_PATH}/MD5SUMS" "${BASE_URL}/${LATEST_VERSION}/MD5SUMS"
+timeout -s INT 30 wget ${WGET_OPTIONS:-} -q -O "${LATEST_PATH}/SHA256SUMS" "${BASE_URL}/${LATEST_VERSION}/SHA256SUMS"
 
 while read line; do
 	read -a tokens <<< $line
@@ -88,18 +90,23 @@ while read line; do
 			echo "Skipping ${filename}"
 		}
 	fi
-	while [[ $downloaded != true ]]; do
+	for retry in `seq ${MAX_RETRY}`; do
 		rm ${dest_filename} || true
 		echo "downloading ${pkg_url} to ${dest_filename}"
 		if [[ -z ${DRY_RUN:-} ]]; then
-			wget ${WGET_OPTIONS:-} -N -c -q -O ${dest_filename} ${pkg_url} && {
+			timeout -s INT "$DOWNLOAD_TIMEOUT" wget ${WGET_OPTIONS:-} -N -c -q -O ${dest_filename} ${pkg_url} && {
 				# two space for md5sum/sha1sum/sha256sum check format
 				echo "${pkg_checksum}  ${dest_filename}" | md5sum -c - && downloaded=true
 			}
 		else
 			downloaded=true
 		fi
+		[[ $downloaded == true ]] && break
 	done
+	if [[ $downloaded == false ]];then
+		echo "failed to download ${pkg_url} to ${dest_filename}"
+		exit 1
+	fi
 
 	case $filename in
 		*Win.exe)