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When adding third-party click and impression tracking parameters into creatives, reachability checks might sometimes fail due to validation servers being blocked. If Zemanta One users are going to insert a tracker that fails the reachability check, an instant warning message will appear. If they are sure the tracker is reachable regardless of the message, they can decide to force skip the validation process by checking the box on the screenshot below.

Learn more on this Zemanta help page.