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Why Does Open Dental Lose Connection to the Server
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Ezra Angelo
- • August 23, 2025
When Open Dental loses its connection to the server, staff cannot access patient records until the connection is restored.
For a practice in the middle of a busy schedule, this is one of the most disruptive IT problems that can happen.
The good news is that Open Dental connection drops have specific, diagnosable causes. Most trace back to network configuration, server stability, or MySQL database issues. Here is how to identify which one is affecting your practice and what to do about it.
Connection errors on all workstations simultaneously always point to the server or network, not individual workstations.
The problem is on that machine
A single workstation losing connection points to that machine’s network adapter, wireless signal, or local configuration. Other workstations functioning normally confirms the server and network are fine.
The server or network infrastructure is the cause
When all workstations lose connection at the same time, the issue is always upstream: the MySQL service, the server’s IP address, a firewall change, or a network failure affecting the entire practice.
Common Causes of Open Dental Connection Drops
Answer two questions to identify the most likely cause affecting your practice.
How many workstations lost connection to Open Dental?
Wireless workstation connection
Open Dental maintains a continuous connection to the MySQL database on the server. A wireless connection that experiences interference or signal fluctuation will drop that database connection, producing a connection error. This is the most common cause of single-workstation Open Dental errors.
The FixSwitch the affected workstation to a wired Ethernet connection. If switching to wired is not immediately possible, move the workstation closer to the wireless access point and check whether other wireless devices on the same network are experiencing connectivity issues. If they are, the wireless infrastructure needs attention.
Firewall or antivirus blocking MySQL port 3306
MySQL uses port 3306 by default for database connections. When a Windows update or antivirus change runs overnight, it can block this port. This type of failure affects all workstations simultaneously and commonly appears the morning after a server update ran overnight.
The FixYour IT provider checks the Windows Firewall and antivirus settings on the server to confirm port 3306 is open and whitelisted. The MySQL service may also need to be restarted once the port is cleared. To prevent recurrence, firewall rules should be reviewed after every major server update.
MySQL service stopped or server IP address changed
Without a known trigger, the issue is most likely one of two things. Check both.
MySQL service stopped on the server
Open Dental runs on MySQL. If the MySQL service stops after a server crash or resource exhaustion, all workstations lose connection simultaneously. Your IT provider opens the Windows Services panel, confirms MySQL is stopped, and restarts it. If MySQL stops frequently, there is an underlying server problem that needs investigation.
Server IP address changed
Workstations connect to the server using its IP address. If the server is set to dynamic IP assignment, a router reboot can assign it a new address. Workstations then cannot find it. The fix is assigning the server a static IP address so it never changes. Your IT provider handles this through the router’s DHCP reservation or by configuring a static IP on the server directly.
Diagnose an Open Dental connection error in four steps
One workstation or all?
One means the problem is local to that machine, likely wireless. All at once means the server or MySQL is the cause.
MySQL service status
Check Windows Services on the server. If MySQL is stopped, restart it. If it stops frequently, there is an underlying server problem.
Server IP must be static
Confirm workstations are pointing to the right address. If the server IP changed after a reboot, assign it a static IP to prevent recurrence.
Recent update overnight?
Server updates commonly break MySQL port 3306 or firewall settings. Check firewall and antivirus rules on the server if an update ran recently.
Open Dental Cloud vs On-Premise
Connection issues are almost always internet problems
Practices running Open Dental’s cloud version through a certified vendor do not have a local MySQL server to maintain. Connection issues in the cloud version trace to internet connectivity problems rather than server configuration issues. If the cloud version is losing connection, check internet speed and stability at the practice first.
Server maintenance responsibility stays with your IT provider
On-premise Open Dental installations give the practice more control but place the responsibility for server maintenance with the practice’s IT provider. Proactive monitoring of the MySQL service, server health, and network stability prevents most connection issues before they affect patients.
Frequently Asked Questions
Ekim IT Solutions works exclusively with dental practices. We serve New England and New York with on-site support and dental practices nationwide with remote support. As a certified Open Dental vendor partner, we know exactly what causes server connection issues and how to fix them without the trial and error.
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- • August 23, 2025
