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I've found a bug that prohibits re-connections if the connection to the PLC is lost. The PDU size will be set to 0 if no PLC is available. In a later connection request the PDU size of 0 will be requested during the communication setup. The PLC will close the TCP connection with an error 66 and no connection can't be established anymore.

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Hampel Software Engineering Thanks for taking the time to report this back, Martin. We've created issue #33 in the repo at https://code.hampel-soft.com/open-source/s7netcom/-/issues/33 and will look into this ASAP.
 •  Reply1 month
Hampel Software Engineering Issue #33 has been fixed in v2.0.0 released just earlier today.
 •  Reply1 month
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