-(sleep 1; $sptps_test -q $d1/client.priv $d1/server.pub localhost 32750 <../README) &
-$sptps_test $d1/server.priv $d1/client.pub 32750 >$d1/out1
+(sleep 1; $sptps_test -4 -q $d1/client.priv $d1/server.pub localhost 32750 <../README) &
+$sptps_test -4 $d1/server.priv $d1/client.pub 32750 >$d1/out1