The message indicates that the concentrator is receiving the initial message from the client twice. This might be seen when the concentrators reply does not get back to the client and the client sends out another message. The fact that all your other clients are working just fine with the same COncentrator indicates that the problem could be with the provide or the specific PC itself. The best solution would be to take another PC to the problamatic clients end and try establising the connection. If you can connect fine, the problem is be with the PC itself. Else, something might be going wrong on your provider's end.
Thanks for the reply. I am suspecting the ISP totally. We have created a true NAT 1-to-1 Internal IP to External IP address at the ISP and this seems to have resolved the problem somewhat. End user still has difficulty connecting on a consistent basis. I am thinking the routing is flawed somewhere.
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We have configured the outside and inside Interface with official ipv6 adresses, set a default route on outside Interface to our router, we also have definied a rule , which also gets hits, to permit tcp from inside Interface to any6.
In Syslog I also se...