iDRAC virtual console download hangs at 0%

Occasionally, when attempting to launch a virtual console from the .jnlp file that I have downloaded from the iDRAC control panel, the Java applet will launch, attempt to download additional jars, but will hang at 0%.

I can't produce this problem at-will, but this seems to be the series of events whenever it does happen:

1. Download the .jnlp file from an iDRAC, and successfully launch virtual console.
2. Repeat successfully for several different iDRACs.
3. On some arbitrary attempt, the downloaded .jnlp file launches, but hangs at 0% forever.

Some notes:

• I have observed this happening on several iDRAC firmware versions in the 2.* range, but most recently on version 2.20.20.20
• Centos 7.2
• OpenJDK version 1.8.0_71
• Iced Tea Java browser plugin
• Chrome browser, version 49.0.2623.87