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Ads Disapproved (DNS Error) -- But they work properly.
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My ad was working fine then was disapproved.  This happened last year, too.   They were disapproved for "destination not working" and "dns error".  But the link does work.  Google support told me they tested it and it's not working.  They said " I have checked the final URL with multiple tools, and can confirm that the URL is not loading for all the countries.  You can also check the same by using this tool (https://www.uptrends.com/tools/uptime)."

When I run that tool, my URL works for all locations except Beijing.  When I run that same test with "google.com", it returns the SAME results, with Beijing failing -- clearly the Beijing tester is not working properly.

I requested the IP addresses that Google's ad validation uses so I can check our server's firewall.  I was told "I may not be able to share a specific IP address but yes, if the website is working globally you may resubmit the ads once again. By doing this, your ads will go under an automated review."

I resubmitted the ads for a third time and they were again disapproved.

It may be that our server is blocking Google's bot.   I have checked our modsecurity rules and they do not block any Google user agents.  I want to check our firewall for an IP block, but without knowing which one to check for, how can I do that?

So it seems likely my server blocks Google's IP address, but Google will not provide a list of IP addresses for me to whitelist.  How can this ever be resolved?  I can't simply clear our firewall's IP deny list.  There are many IPs in there that are known bad for one reason or another and represent a thread to our server. 

What is the solution?
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Advertising Expert by Way of Engineering.
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Have you tried to change the hosting service?
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This is a dedicated server.  I am in control of the firewall.
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A Passionate Technologist From The 1980's
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Hi Vinnie,
 
I have used Google Ads across the globe and with nearly every type of server setup, including dedicated servers where you cannot get root access or only get a striped CPANEL access, etc., and all my previous info still applies. 
 
All the Best,
 
James
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A Passionate Technologist From The 1980's
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Hi Vinnie,
 
Perfect. If your issue was solved with those specific ranges great... but that is far from complete. But, again, you solved your own issue through sleuthing it out, and that is great. 
 
Cheers,
 
James
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