R60 SecuRemote Client Changing Behaviour

Hi all,

I'll make it short,
In my company we use checkpoints vpn clients with certificates for
There are certain geographical sites from which clients can't connect.
I the Tracker is see this log error from their attempts:

phase1 received notification from peer: invalid certificate

From other places this same clients Can connect successfully.

Any Ideas?

Can a simple office firewall disrupt the authentication process?

Thank You Very Much.