![]() ![]() NOTE: You can also open the window by starting the Run dialog box, entering secpol.msc, and clicking OK. In the Windows search box on the taskbar, enter Local Security Policy.You must turn this option off as follows: This default setting does not allow you the necessary authentication level for working. This is also known as Simple File Sharing. The default setting in Windows XP and later when using workgroups is to force local users to authenticate as guest. You must carefully ensure that all combinations match on both computers. In the case of callbacks, it is possible that the user name and passwords on one computer do not match the other computer. It is imperative that both the user name and password are recognized on both the OPC client and server computers. Windows will reject this combination for various reasons as described in the following procedures. Once a callback reaches the OPC client computer, the operating system will attempt to authenticate the arriving user name and password combination with its existing list. ![]() ![]() Once the communication works, ensure that you turn the Firewall back on. Select Turn off Windows Firewall (not recommended).The Customize Settings window displays.Select Turn Windows Firewall on or off.In the Windows search box on the taskbar, enter Windows Defender Firewall.
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