WICS was working OK for months, but then was saying "likely firewall Problem"

I use WICS on Exchange Server 2019. It had been working fine for months, but all of the sudden it stopped working and was giving me this error:

"detail": "x.x.x.x: Fetching http://<fdqn>/.well-known/acme-challenge/rYF6kVvSUrF76CfFGPdDl4W_HilIX7fHlGsey81v2yc: Timeout during connect (likely firewall problem)",

But now I get:

Failed to create order: Error creating new order :: too many failed authorizations recently: see Failed Validation Limit - Let's Encrypt

When reading the Failed Validation Limit - Let's Encrypt it says " Overrides are not available for the Failed Validation limit."

I am not sure what that means. Will it let me retry authorization at some point or not?

Any advice, info on this is appreciated. - Thanks

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Hi @Jkocan, and welcome to the LE community forum :slight_smile:

Yes, per the rate limits, you have exceeded the per hour failed requests.
See: Rate Limits - Let's Encrypt

You should use the testing environment for all such testing.


All issuance requests are subject to a Failed Validation limit of 5 failures per account, per hostname, per hour.

From the page you linked - wait an hour


And then...
You can troubleshoot the real problem:


Ah... Thank you. Hopefully I will be able to figure out the firewall problem. It was working great for months and all of the sudden stopped.

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Often it is because someone blocked port 80 since the last time you got a cert.


Like many ISP are doing these days - I still can't grasp any benefit of them doing that.


For anyone that is interested. For some reason HTTP must have been blocked at the firewall level. I figured it out by going to the validation URL that was in the request. Also updated to the latest WACS.

So future note to self: make sure http is enabled to the server, not just https.

Thanks for all of your help guys. I really appreciate it.


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