option ssl-ignore-unknown-ca ignored?

Hello subversion-team,

I'm already searching for hours and don't have a clue, why I still get
this error:

  svn: PROPFIND of '/svn/main/trunk/NightlyBuild': Server certificate
verification failed: issuer is not trusted (https://ipanema.nightlabs.org)

I use the following command:

  svn co --config-dir subversion --non-interactive --username nightly
--password MYPASS
https://ipanema.nightlabs.org/svn/main/trunk/NightlyBuild NightlyBuild

My "servers" file looks like this:

---
[global]
ssl-ignore-host-mismatch = true
ssl-ignore-unknown-ca = true
---
It is located in the subdirectory "subversion" as specified to svn with 
"--config-dir".
What am I doing wrong? Is there an easier possibility (e.g. passing the 
options to svn directly via a parameter)?
Thanks a lot in advance for your help!
Best regards, Marco :-)
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