Problem ssl vpn client

Good morning,
on an atp 500, firmware V5.30 (ABFU.0), i configured a ssl vpn connection.
On the various PCs I have installed the ZyWALL SecuExtender client.
It happens on many stations that at a first connection everything works, in subsequent connections it is not possible to connect in vpn. Uninstalling ZyWALL SecuExtender and reinstalling the problem is solved momentarily and then recurs.
Some advice? Thank you

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