can you try to run svn checkout
once manually to your URL https://yoururl/trunk C:\ant-1.8.1\Test_Checkout
using command line and accept certificate.svn
Or as @AndrewSpear says belowthis
Rather than checking out manually run svn list https://your.repository.url
from Terminal (Mac) / Command Line (Win) to get the option to accept the certificate permanentlyurl
svn will ask you for confirmation. accept it permanently.code
After that this should work for subsequent requests from ant script.ip