Is this the most recent version:
OS + version: Ubuntu 16.04 LTS
CPU architecture (32-bit / 64-bit): amd64
Window manager: Xorg/Unity
URLs (if relevant): https://pki.pappad.info
Behavior in Linux Firefox: Works well

Chromium	53.0.2785.143 (Developer Build) Built on Ubuntu , running on Ubuntu 16.04 (64-bit)
Revision	12ae4ebf489873fc4aad9efc231b9151b330a938
OS	Linux 
Blink	537.36 (@12ae4ebf489873fc4aad9efc231b9151b330a938)
JavaScript	V8 5.3.332.47
Flash	(Disabled)
User Agent	Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Ubuntu Chromium/53.0.2785.143 Chrome/53.0.2785.143 Safari/537.36
Command Line	/usr/lib/chromium-browser/chromium-browser --enable-pinch --window-depth=24 --x11-visual-id=32 --wm-user-time-ms=90204407 --flag-switches-begin --flag-switches-end

URLs (if applicable) : https://pki.pappad.info
Other browsers tested: Mozilla Firefox v45
  Add OK or FAIL, along with the version, after other browsers where you
have tested this issue:
    Firefox: OK

What steps will reproduce the problem?
(1) Go to website requiring pkcs11 token (eg https://pki.pappad.info)

What is the expected result?
Chromium will present me with a menu option to enter my PIN for my DoD pkcs11 certificate.
It will let me select my desired certificate.
Web page will authenticate, I will be able to access data.

What happens instead?
ERR_SSL_PROTOCOL_ERROR is displayed on an error page.

Please provide any additional information below. Attach a screenshot if
possible.
Package: coolkey
Version: 1.1.0-13ubuntu2

Package: pcscd
Version: 1.8.14-1ubuntu1

Package: libccid
Version: 1.4.22-1