diff --git a/testssl.sh b/testssl.sh
index b4cf211..c4f9fe6 100755
--- a/testssl.sh
+++ b/testssl.sh
@@ -1922,40 +1922,43 @@ http_head() {
 #    arg2: extra http header
 #
 # return codes:
-#    0: all fine
-#    1: server dind't respond within HEADER_MAXSLEEP
-#    3: server dind't respond within HEADER_MAXSLEEP and PROXY was defined
+#    0: all fine (response header is returned as string)
+#    1: server didn't respond within HEADER_MAXSLEEP
+#    3: server didn't respond within HEADER_MAXSLEEP and PROXY was defined
 #
-http_header_printf() {
+http_head_printf() {
      local request_header="$2"
      local useragent="$UA_STD"
-     local tmpfile=$TEMPDIR/$NODE.$NODEIP.http_header_printf.log
-     local errfile=$TEMPDIR/$NODE.$NODEIP.http_header_printf-err.log
+     local tmpfile=$TEMPDIR/$NODE.$NODEIP.http_head_printf.log
+     local errfile=$TEMPDIR/$NODE.$NODEIP.http_head_printf-err.log
      local -i ret=0
      local proto="" foo="" node="" query=""
 
      [[ $DEBUG -eq 0 ]] && errfile=/dev/null
 
      IFS=/ read -r proto foo node query <<< "$1"
-     exec 33<>/dev/tcp/$node/80
-     printf -- "%b" "HEAD ${proto}//${node}/${query} HTTP/1.1\r\nUser-Agent: ${useragent}\r\nHost: ${node}\r\n${request_header}\r\nAccept: */*\r\n\r\n\r\n" >&33 2>$errfile &
+     node=${node%:*}
+     # $node works here good as it connects via IPv6 first, then IPv4
+     bash -c "exec 33<>/dev/tcp/$node/80" >/dev/null &
      wait_kill $! $HEADER_MAXSLEEP
      if [[ $? -ne 0 ]]; then
-          # not killed
+          # not killed --> socket open. Now we connect to the virtual host "$node"
+          printf -- "%b" "HEAD ${proto}//${node}/${query} HTTP/1.1\r\nUser-Agent: ${useragent}\r\nHost: ${node}\r\n${request_header}\r\nAccept: */*\r\n\r\n\r\n" >&33 2>$errfile
+          ret=0
+          if [[ $DEBUG -eq 0 ]] ; then
+               cat <&33
+          else
+               cat <&33 >$tmpfile
+               cat $tmpfile
+          fi
+     else
           if [[ -n "$PROXY" ]]; then
                ret=3
+          else
+               ret=1
           fi
-          ret=1
-     else
-          ret=0
      fi
-     if [[ $DEBUG -eq 0 ]] ; then
-          cat <&33
-     else
-          cat <&33 >$tmpfile
-          cat $tmpfile
-     fi
-     exec 33<&-
+          exec 33<&-
      exec 33>&-
      return $ret
 }
@@ -1963,9 +1966,6 @@ http_header_printf() {
 
 ldap_get() {
      local ldif
-     local -i success
-     local crl="$1"
-     local tmpfile="$2"
      local jsonID="$3"
 
      if type -p curl &>/dev/null; then
@@ -17703,7 +17703,7 @@ run_opossum() {
      case $service in
           HTTP)
                uri=${URI/https:\/\//}
-               response=$(http_header_printf http://${uri} 'Upgrade: TLS/1.0\r\n\r\nClose\r\n')
+               response=$(http_head_printf http://${uri} 'Upgrade: TLS/1.0\r\n\r\nClose\r\n')
                # In any case we use $response but we handle the return codes
                case $? in
                     0)   ret=0 ;;