If you have changed the TCP/IP protocol settings, you can reset them to the defaults.
Procedure
To restore the TCP/IP configuration to the default settings, follow these steps:
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Select the Ethernet interface in the project tree in "Online access".
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Select the "Properties" command in the shortcut menu of the interface.
The dialog for configuring the interface opens.
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Select "Configurations > TCP/IP".
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Click the "Standard" button to reset all the settings.