ZyXEL Communications 2WG - Manual (Page 193)

ZyWALL 2WG Support Notes
All contents copyright (c) 2006 ZyXEL Communications Corporation.
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9. On P2 Proposal settings, select Encryption to DES, and Authentication to SHA1, and also press “-”
button to delete the second P2 proposal rules.
10. To uncheck the Enable perfect forward secrecy(PFS) check box. And then, press OK button to save
the settings.