A device running the CrashPlan app cannot connect to a destination because an administrator is using deep packet inspection to examine traffic from devices to the CrashPlan cloud. This article describes the problem and how to resolve it.
The CrashPlan app connects to the CrashPlan cloud then disconnects immediately.
Communication between devices and the CrashPlan cloud uses transport-layer security (TLS). When an administrator uses a deep packet inspection tool to examine CrashPlan traffic, it can interfere with TLS.
Deep packet inspection is a common technique for analyzing traffic going over 443 and works well in most situations. However, using deep packet inspection for TLS traffic over port 443 can cause communication interruptions.
To resolve the issue, we advise you to either turn off deep packet inspection altogether, or add our our IP addresses to the allowlist in the deep packet inspection tool.
Also do the following:
- Open ports 4287 and 443 for the CrashPlan app to use.
- Verify that network traffic settings are optimized for where your employees work.
For more ideas to resolve connection problems, see Cannot connect to destination (CrashPlan).