📝 Overview
Learn how to reconnect client computers when they lose connection to the server computer. These steps assume the software is installed and working on the server computer.
⚠️ Before you start
Networking can be complex, and connection issues are often related to Windows settings, firewalls, or your local network setup. If you’re unsure about any of the steps in this guide, or would like help confirming your setup, please reach out to our Support team. We’re happy to assist.
🛠️ Troubleshooting Steps
Learn how to check your connection settings, rule out firewall/network issues, and resolve common SQL Server-related causes.
🧭 Step 1: Confirm the correct server name
If you’re connecting from a client computer and it can’t find the database, confirming the server name helps ensure you’re pointing to the correct computer.
⚠️ Please Note: If your server and a client computer share the same computer name, the client may not be able to connect. Rename one of the computers in Windows before continuing.
🔌 Step 2: Reconnect from the client computer
If the client computer shows “No Database Open,” “SQL Server could not be found,” or similar connection errors, use these steps to reconnect to the server database.
Click the arrow to learn how to reconnect to the server from a client computer
Click the arrow to learn how to reconnect to the server from a client computer
Go to the client computer that is not connecting and open the software.
If you see “SQL Server could not be found,” select Continue without Connecting (you should see No Database Open).
Go to File → Database Settings → Connection Settings (or Edit Connection Settings, depending on what you see).
Choose This is an additional computer (client) and select Continue.
Choose Manual Setup, then enter the server name you recorded (Step 1) in the Connect to field.
Select Continue/Connect.
If prompted, enter your database password (if one was set).
🧱 Step 3: Check for firewall blocks on the server
If you get errors like “SQL Server was not found,” the most common causes are a server-side firewall or a network communication issue.
Click the arrow to learn more about firewall conflicts
Click the arrow to learn more about firewall conflicts
On the server computer, temporarily turn off Windows Firewall (and any antivirus firewall such as Norton/McAfee).
Try connecting again from the client computer.
If the client connects with the firewall off, turn the firewall back on and set up firewall exceptions instead of leaving it disabled.
📡 Step 4: Run a ping test (client → server)
A ping test confirms whether the client computer can communicate with the server over your network.
Click the arrow to learn how to run a ping test
Click the arrow to learn how to run a ping test
On the client computer, open Command Prompt (Windows Start → Accessories → Command Prompt).
Type:
ping [server computer name]and press Enter.Example: if the server name is
THOMAS\\CMJ, you would pingTHOMAS.
If ping is successful, it’s likely not a network visibility issue (go back to firewall checks or proceed to “Other Suspects”).
If ping fails, try these basics:
🧷 Step 5: Temporary workaround — connect using the server IP address
⚠️ Please Note: This is not recommended if your server is assigned an IP address dynamically (the address may change and break connections again).
Click the arrow to learn how to connect to the server IP
Click the arrow to learn how to connect to the server IP
On the server, open Command Prompt and type
ipconfig.Locate the IPv4 Address (or “IP Address” on older Windows versions).
On the client, go back to the Select Server screen and replace the server name with the server’s IP address, then select Connect/OK.
If needed, try pinging the IP address from the client the same way you pinged the server name.
🧩 Step 6: Uncommon Suspects
Roughly 99% of client connectivity issues are caused by server-side firewalls or network problem, only try these after exhausting the steps above.
Click the arrow to learn more about other potential issues
Click the arrow to learn more about other potential issues
Client-side outbound firewalls: Some antivirus tools include outbound firewalls. Disable them or configure exceptions.
SQL Server Browser is disabled:
Windows Start → Microsoft SQL Server 2012 → Configuration Tools → SQL Server Configuration Manager
Go to SQL Server 2012 Services and ensure SQL Server Browser is Running and set to Automatic.
TCP/IP is disabled for the SQL instance:
SQL Server install issues: If all clients are unable to connect and you have verified backups, a reinstall of SQL Server may be required.
❓ FAQs
Find answers to common questions or additional details that may not be covered in the main instructions.
Click the arrow to view frequently asked questions
Click the arrow to view frequently asked questions
What’s the most common cause of client computers not connecting?
Click the arrow to view the answer
Click the arrow to view the answer
Most connection issues are caused by server-side firewall blocks, internet connection, or the client not being able to see the server on the network.
Should I leave Windows Firewall turned off?
Click the arrow to view the answer
Click the arrow to view the answer
No. Turning it off is a good temporary test. If that resolves the issue, turn it back on and configure firewall exceptions instead of leaving your firewall disabled
Can I connect using the server IP address?
Click the arrow to view the answer
Click the arrow to view the answer
Yes, but it should be temporary unless your server has a static IP address. If your IP is dynamic, it may change and break the connection again.


