This is easliy done in a Linux environment by editing the existing servers text file. On Windows it is not easily done and not recommended.
On a Linux system, edit the ~/.subversion/servers file by adding the line "neon-debug-mask = 130" (without quotes) to the [global] section of the file, making sure that you also un-comment the [global] line as well. Once Neon debugging is enabled, you should see much more output from each svn command.
Although Neon debugging is possible on Windows, it involves steps that are too complex for most end users to undertake, including compiling Windows binaries for the specific platform and manually handling any errors that arise during that process.