Authentication Failure - Possible SSL/TLS Issue

The latest version broke authentication with my private server on my Android 4.2.2 (SCH-I535 Galaxy S3) device. My server doesn't even see an authentication attempt being made in the web server logs. I can connect to the official GitLab service just fine though. It was working on this device before the last two play store updates I received.

The error received on the client is: "Login failed. Please check your login information"

I've tried email/password, username/password, and private token authentication. All three options return the same error message.

I'm using a SSL certificate from Let's Encrypt, and the intermediate security setting provided by Mozilla here: https://wiki.mozilla.org/Security/Server_Side_TLS#Intermediate_compatibility_.28default.29

I do have a LG Gpad 3 tablet running Lollipop that does work with the latest release. I suspect that this may be an SSL/TLS issue with older devices.