I try connection to a PIX501, but after authenticating with username/password I get "403: unable to contact the security gateway".

In the Cisco VPN client log I found the following indication something's wrong, the rest of the log seemed OK...

43 21:38:02.078 03/18/06 Sev=Info/4 IKE/0x63000017

Marking IKE SA for deletion (I_Cookie=653F5F9B11798870 R_Cookie=91D3A2210C12289C) reason = DEL_REASON_IKE_NEG_FAILED

44 21:38:02.093 03/18/06 Sev=Info/4 IPSEC/0x63700014

Deleted all keys

45 21:38:05.093 03/18/06 Sev=Info/4 IKE/0x6300004A

Discarding IKE SA negotiation (I_Cookie=653F5F9B11798870 R_Cookie=91D3A2210C12289C) reason = DEL_REASON_IKE_NEG_FAILED

Any comments to this?