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[Tobias Brunner]

Hi Matt,

> I've been trying to make a connection between my home PC and the
> Watchguard XTM330 we have at the office.

It seems that box supports IKEv2 (at least the GUI has a version
dropdown field).  If possible, switch to that version.

> could anyone shed some light on this one for me ?  would greatly
> appreciate any help I could get

The most likely reason for your current problem is a mismatched PSK.

Regards,
Tobias