Test your network connection to CrashPlan servers

Updated October 02, 2026 23:14

A connection test confirms whether a computer can reach the CrashPlan cloud on the ports the CrashPlan app uses. The test helps identify connections blocked by a firewall, antivirus software, a VPN, or another part of the network configuration. It uses command-line tools included with Windows, Mac, and Linux.

Server addresses and ports for each CrashPlan cloud instance

The server address and the ports to test depend on the CrashPlan cloud instance that hosts your organization. The cloud instance matches the address used to sign in to the CrashPlan console.

Cloud instance	CrashPlan console address	Server address to test	Ports to test
US1	`console.us1.crashplan.com`	`clients.us1.crashplan.com`	4287
US2	`console.us2.crashplan.com`	`clients.us2.crashplan.com`	443 4287
EU5	`console.eu5.cpg.crashplan.com`	`clients.eu5.cpg.crashplan.com`	4287

Port 443 applies to US2 only: The CrashPlan app connects to the US1 and EU5 server addresses on port 4287 only. A test of port 443 against clients.us1.crashplan.com or clients.eu5.cpg.crashplan.com times out and does not indicate a connection problem.

Test the connection on Windows with PowerShell

PowerShell is included with Windows. The Test-NetConnection command tests one server address and one port at a time.

Open the Start menu and open Windows PowerShell.

Enter the command with the server address and a port for your cloud instance, then press Enter.
Format:

Test-NetConnection -ComputerName [server address] -Port [port]

Example for US2:

Test-NetConnection -ComputerName clients.us2.crashplan.com -Port 4287

Review the result.
- Connection succeeded: The output includes TcpTestSucceeded : True.
- Connection failed: The output includes WARNING: TCP connect to [...] failed and TcpTestSucceeded : False.
Repeat the command for each remaining port listed for your cloud instance.

Test the connection on Mac or Linux with Netcat

Netcat (nc) is included with Mac and with most Linux distributions. The nc command tests one server address and one port at a time.

Open the Terminal application.
Enter the command with the server address and a port for your cloud instance, then press Enter.
Format:
```
nc -vz [server address] [port]
```
Example for US2:
```
nc -vz clients.us2.crashplan.com 4287
```
Review the result.
- Connection succeeded: The output includes succeeded! or Connected.
- Connection failed: The output includes Operation timed out or Connection refused.
Repeat the command for each remaining port listed for your cloud instance.

Resolve a failed connection test

A failed test on a port listed for your cloud instance means the computer could not open a connection to the CrashPlan cloud on that port. The most common cause is a firewall or security product on the computer or the network.

Confirm that the address and port in the command match the values for your cloud instance. Port 443 is tested for US2 only.
Check the CrashPlan status page for a service incident affecting your cloud instance.
Allow outbound connections to CrashPlan in the firewall. For the domains, IP addresses, and ports to allow, see IP addresses, domains, and ports used by CrashPlan.
Add CrashPlan to the exclusion list of antivirus, security, and VPN software. For details, see Known software conflicts with the CrashPlan app and Best practices for using CrashPlan with Endpoint Detection and Response (EDR) software.
Run the connection test again.

If the test continues to fail, run the test from a different network. A test that succeeds on the other network indicates that the first network is blocking the connection.