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Can't generate Let's Encrypt certificate - "status":403

I'm having a problem creating Let's Encrypt certificate, its give me that error:

Let's Encrypt certificate wasn't created.
"type":"urn:ietf:params:acme:error:unauthorized"
"detail":"19x.x.xx.xxx: Invalid response from xxxxxxxxx:443/.../BZ6WwHjgKdSKNKK4RlrdG9O6WhSXxkE7627w4d5ORto: 404"
"status":403

My website its protected by WAF, on port 80, 

I have more than 5 alias WAN interfaces

its was working in the version:SFOS 21.0.1 MR-1-Build272,  after i update to SFOS 21.0.1 MR-1-Build277 its stoped to work

help me, i have a lot of websites that depends on it



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