Timeout error in VPN connection

32/64 bit multi-platform Ethernet S7 PLC communication suite

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Timeout error in VPN connection

Forum: General Discussion

Creator: Penzium

Created: 2021-05-03

Updated: 2021-07-27

Penzium - 2021-05-03

Hi,

in a project I am using the Labview wrapper of the Snap7 library (last version 1.4.2) for reading and writing data. I have two PLC Siemens S7-1200 that are accessible via OpenVPN connection.

I read from both PLC every second and I write a byte to both PLC always every second.

The software that I have developed seems to works ok, reading and writing works ok but after some time (12 to 24 hour) I receive a huge number of error 665420 ISO : An error occurred during recv TCP : Connection timed out.

In my software I have a mechanism that if I receive that error I destroy the client and reconnect but the errors doesn't disappear but continues for some hours before stopping. The phenomenon seems to repeat.

Are there some problems using this library in a VPN connection? I am testing my software connecting to the PLCs directly without VPN, in 24 hour I didn't receive this errors.

Someone used PLC in VPN connections? What type of problems has encountered? I need a particular configuration?

Thanks.

Penzium

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jack - 2021-07-27

Thank to clear my doubt about VPN

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