Cause: SQL Server Browser service is stopped. Fix: Open Services.msc > Find "SQL Server Browser" > Startup type: Automatic > Start. Then, ensure TCP/IP is enabled in SQL Configuration Manager.
Even with a legitimate ZKAccess 5.2 software download, you may encounter technical snags. Here is the troubleshooting matrix: Zkaccess 5.2 Software Download
| Error Code / Message | Cause | Solution |
| :--- | :--- | :--- |
| "Setup cannot find SQL Server" | Missing instance or wrong naming | Reinstall SQL with default instance SQLEXPRESS. Use .\SQLEXPRESS in the connection string. |
| "DLL load failure: MSVCR120.dll missing" | Missing Visual C++ Redistributables | Download and install "VC++ 2013 Redist" (x86 and x64) from Microsoft. |
| "Device not responding" after adding IP | Firewall blocking port 4370 | Add an inbound rule for port 4370 (TCP/UDP) in Windows Defender Firewall. |
| "License expired" | Trying to use paid ACS features | Use "Time Attendance" mode (free). Access Control features (door relays) require a hardware dongle. |
| "Language corrupted" | Partial installation | Reinstall or copy Lang_English.ini from the installation \Resources backup folder. | Cause: SQL Server Browser service is stopped
Rating: 2.5/5
This is the software's weakest point. The UI looks like it was designed in the Windows XP era. Rating: 2