I see messages like this from time to time in the IPSec VPN router. If you see an occasional message like this I believe it reflects a transient event (and may well be caused by something happening in the provider network) and is not a serious problem. If you see lots of these messages it might reflect something else.
Can you give us more understanding of how often you see this. And if you believe it reflects a problem it would be helpful to have information on the platform on which it is happening and the version of code that you are running.
Thanks for the additional information. When you say that you see it every day, it would be helpful to know if you see it a few times a day, or many times a day. In fact what would probably be helpful is to know how many times it happened (over some period of time) and how many packets were sent during that period of time. So is the error happening for a large percentage of packets or a small percentage?
Another way to ask this question is to ask whether you are seeing impact on connectivity or are you just seeing messages in the logs and want to investigate. Is it having real impact?
I ran 12.3(8)T on a number of VPN routers and had some issues. I moved most of the routers to 12.3(14)T and they did better. I am now moving most of these routers to 12.4(3) and having good results. I do not know whether newer code will help resolve your issue but it might be worth trying.
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