Error: "A network error occurred while communicating with the Connection Manager"

How to resolve the error: "A network error occurred while communicating with the Connection Manager" when opening a Sage 50 Accounting data file.

 NOTE: It is recommended to restart the server and all computers before attempting these steps. 

Check the System Requirements

1. Verify that the computer meets the system requirements to run Sage 50.
2. Ensure the server or data location computer has the latest version of Sage 50 also installed.
3. If you recently updated Sage 50, verify that you're using the new Sage 50 icon.

Disable antivirus and firewall

1. Temporarily disable the antivirus and firewall.
2. Verify that you can open the data file.
3. If the data file opens, contact your IT to allow Sage 50 ports through the antivirus and firewall.

Restart the Connection Manager and open locally

1. Restart the connection manager.
2. Make sure you can open the sample company.
3. Copy the file to a new folder on the C:\ drive.
4. Open the company file from this new location.

Verify the Connection Manager is running

1. Ensure that the Sage Connection Manager is installed and running on the same server where the data resides.
2. Check that the connection Manager is running on all other computers that store Sage 50.
3. Check the Connection Manager's version number on all computers and ensure they're the latest number.

Check if the data folder is compressed

1. Check if the folder icon has two blue arrows. This means that the folder is compressed.
2. To uncheck the option to compress folders:
   • Right-click the folder, select Properties
   • Under the General tab, click Advanced
   • Deselect the option to Compress contents to save disk space and click OK
   • Click Apply, then OK

Install the Full Version of Sage 50 on the Server

1. Install the full version of Sage 50 on the server.
2. Check if the data or sample works locally.