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After changing the security settings in TIA Portal, it is necessary to go to the menu Compile → "Software (Rebuild all)" and after compiling to upload the project to PLC. A partial rebuild may not be sufficient.
As of STEP 7 V17, the following procedure is advised to get the communication working: use Online & diagnostics to perform a Reset to Factory Settings and mark the box labeled "Delete password for protection of confidential PLC configuration data".
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