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Thank you for the insight. Not to be argumentative but IMO, they really needed to post their entire iptable for troubleshooting, as convoluted as it might be and as poorly as their iptable might be implemented. And they did try to narrow down the problem to a specific rule via the OPs "...After some attempts, I find that the problem is in the INPUT policy, and not..." Personally as a person seeking help from peers, I would hope some unintentional ignorance would be acceptable.
I definitely would like to see a better question with a better set of answers, but that's not how things go sometimes. In terms of it being closed, I figured I was just missing something and if not, it would nice to see it reopened.
