It turns out that the first line above for additional credentials was the correct one:
<https://my.server:443 <https://my.server/>> Company SVN Server: Authorized Users Only The reason it wasn't working is because the default Jenkins install is configured (in Managed Jenkins -> Configure System) to use 'Subversion Workspace Version' 1.4. Changing this to 1.8 (the highest value currently) made the above errors go away. -- You received this message because you are subscribed to the Google Groups "Jenkins Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/jenkinsci-users/7818e014-69f3-41de-bb60-f3de74e5e33e%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
