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Certain websites not opening

We are facing a weird problem.

We have an internal WLC and a guest WLC in DMZ. The issue is: sometimes wireless guests are not able to open certain websites while other websites work fine.

On the internet facing edge, we have three edge routers. We have four Internet links, with one router terminating two links and the other two routers terminating one, one each. When the issue happens, I can see pat translations happening on our edge router for the guest IP, but still page does not load.

Any ideas on how to check the issue further?

PS: I rate useful posts.

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