Svn will not remember passphrase for client certificate.

[Chris Capon <tt...@gmail.com>]

Subversion v1.9.3, Apache2 v2.4.18

Our subversion server uses SSL with client certificates.  When performing
any action against the repository using the svn client, a prompt appears
asking for the password to the client certificate.  (Note: this is not the
user id / password combination).

Expected action:  After the first time prompting for the password, svn
should have preserved it and not asked for it again.

Below is a sample session.  Attached is the user's config file.

Any help you can offer will be appreciated.
Thanks.

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cc@ccvm:~/Robust/Client$ svn --version
svn, version 1.9.3 (r1718519)
   compiled Mar 14 2016, 11:39:40 on x86_64-pc-linux-gnu

Copyright (C) 2015 The Apache Software Foundation.
This software consists of contributions made by many people;
see the NOTICE file for more information.
Subversion is open source software, see http://subversion.apache.org/

The following repository access (RA) modules are available:

* ra_svn : Module for accessing a repository using the svn network protocol.
  - with Cyrus SASL authentication
  - handles 'svn' scheme
* ra_local : Module for accessing a repository on local disk.
  - handles 'file' scheme
* ra_serf : Module for accessing a repository via WebDAV protocol using
serf.
  - using serf 1.3.8 (compiled with 1.3.8)
  - handles 'http' scheme
  - handles 'https' scheme

The following authentication credential caches are available:

* Plaintext cache in /home/cc/.subversion
* Gnome Keyring
* GPG-Agent
* KWallet (KDE)

cc@ccvm:~/Robust/Client$ svn update
Updating '.':
Passphrase for '/home/cc/Robust/ccapon.p12': ***************

At revision 3127.
cc@ccvm:~/Robust/Client$ svn update
Updating '.':
Passphrase for '/home/cc/Robust/ccapon.p12': ***************

At revision 3127.
cc@ccvm:~/Robust/Client$