skiiiks
January 31, 2022, 11:21am
1
Hi !
I successfully added Let's Encrypt to my domain name in my Apache webserver through certbot software.
Everything is working perfectly and the certificate is active (expires in about 2 months).
But I'm receiving a lot of requests of this kind (every day!):
{mydomain}/.well-known/acme-challenge/xcDgbf9ngql4arA.....
Obviously, it returns 404 since the .well-known directory does not exists. It's created with certbot installation/renewal process, and after that is deleted.
Why is that? How can I avoid this requests?
Thank you
9peppe
January 31, 2022, 1:51pm
2
If you are not calling for those verifications, ignore them.
Somebody is trying (and failing) to obtain a certificate for your domain. Or they are just hitting your server with those requests. What IP address are they coming from?
2 Likes
skiiiks:
Why is that?
Could you be making faulty requests in a cron job or systemd timer? For example, if you were issuing certonly --webroot -w X type certbot commands with a wrong X value for your DocumentRoot folder you would see 404 requests.
Check /var/log/letsencrypt folder for history of certbot runs to see if it is you.
2 Likes
All request have the User Agent: "Mozilla/5.0 (compatible; Let's Encrypt validation server; +https://www.letsencrypt.org)" , that's the reason of my doubt
This is just for the last week ... so you can notice the times requests were done, and the IP's ...
timestamp request.user_ip
1/31/2022 12:18pm 2602:fd3f:3:10a:0:242:ac11:23
1/31/2022 12:14pm 213.94.18.130
1/31/2022 7:21am 2600:1f14:804:fd02:dcdc:391a:9b83:9c03
1/31/2022 7:21am 2600:1f16:269:da01:93df:3a01:5143:6ae0
1/31/2022 7:21am 2600:3000:1511:200::30
1/31/2022 7:21am 2600:3000:1511:200::1d
1/31/2022 7:21am 2600:1f14:804:fd01:26e9:d143:22f9:90af
1/31/2022 7:21am 2600:3000:1511:200::1d
1/31/2022 7:21am 2a05:d014:3ad:702:5e21:33c4:d5b3:ec3a
1/31/2022 7:21am 2600:1f14:804:fd00:1a23:ba70:d216:d839
1/31/2022 7:21am 2600:1f16:269:da00:e45:a547:1761:71
1/31/2022 7:21am 2a05:d014:3ad:701:cace:1ed4:ea8b:49f
1/31/2022 7:21am 2600:1f16:269:da02:295d:8c92:b202:43ac
1/31/2022 7:21am 2a05:d014:3ad:700:2636:9bd6:4525:3c72
1/31/2022 7:21am 2a05:d014:3ad:701:cace:1ed4:ea8b:49f
1/31/2022 7:21am 2600:1f16:269:da00:e45:a547:1761:71
1/31/2022 7:21am 2600:1f14:804:fd02:dcdc:391a:9b83:9c03
1/31/2022 7:21am 2600:3000:1511:200::31
1/31/2022 7:21am 64.78.149.164
1/31/2022 7:21am 3.142.122.14
1/31/2022 7:21am 18.159.196.172
1/30/2022 3:19pm 2600:3000:2710:200::1d
1/30/2022 3:19pm 2600:1f14:804:fd02:dcdc:391a:9b83:9c03
1/30/2022 3:19pm 2600:3000:2710:200::1d
1/30/2022 3:19pm 2600:3000:2710:200::31
1/30/2022 3:19pm 2a05:d014:3ad:700:2636:9bd6:4525:3c72
1/30/2022 3:19pm 2600:1f14:804:fd02:dcdc:391a:9b83:9c03
1/30/2022 3:19pm 2600:1f16:269:da01:93df:3a01:5143:6ae0
1/30/2022 3:19pm 2600:1f14:804:fd02:dcdc:391a:9b83:9c03
1/30/2022 3:19pm 2600:1f16:269:da00:e45:a547:1761:71
1/30/2022 3:19pm 2600:1f16:269:da01:93df:3a01:5143:6ae0
1/30/2022 3:19pm 2a05:d014:3ad:700:2636:9bd6:4525:3c72
1/30/2022 3:19pm 2a05:d014:3ad:702:5e21:33c4:d5b3:ec3a
1/30/2022 3:19pm 2600:1f14:804:fd01:26e9:d143:22f9:90af
1/30/2022 3:19pm 2600:1f16:269:da02:295d:8c92:b202:43ac
1/30/2022 3:19pm 2600:3000:2710:200::1d
1/30/2022 3:19pm 2a05:d014:3ad:701:cace:1ed4:ea8b:49f
1/30/2022 3:19pm 66.133.109.36
1/30/2022 3:19pm 3.142.122.14
1/30/2022 12:31am 2600:1f14:804:fd00:1a23:ba70:d216:d839
1/30/2022 12:31am 2600:3000:1511:200::31
1/30/2022 12:31am 2600:3000:1511:200::30
1/30/2022 12:31am 2600:1f16:269:da02:295d:8c92:b202:43ac
1/30/2022 12:31am 2600:1f14:804:fd00:1a23:ba70:d216:d839
1/30/2022 12:31am 2600:3000:1511:200::1d
1/30/2022 12:31am 2600:1f16:269:da00:e45:a547:1761:71
1/30/2022 12:31am 2a05:d014:3ad:700:2636:9bd6:4525:3c72
1/30/2022 12:31am 2a05:d014:3ad:701:cace:1ed4:ea8b:49f
1/30/2022 12:31am 2a05:d014:3ad:701:cace:1ed4:ea8b:49f
1/30/2022 12:31am 2600:1f16:269:da01:93df:3a01:5143:6ae0
1/30/2022 12:31am 2600:1f16:269:da02:295d:8c92:b202:43ac
1/30/2022 12:31am 2600:1f14:804:fd00:1a23:ba70:d216:d839
1/30/2022 12:31am 2a05:d014:3ad:701:cace:1ed4:ea8b:49f
1/30/2022 12:31am 2600:3000:2710:200::31
1/30/2022 12:31am 66.133.109.36
1/30/2022 12:31am 3.19.56.43
1/30/2022 12:31am 3.120.130.29
1/29/2022 7:27pm 2600:3000:1511:200::1d
1/29/2022 7:27pm 2600:1f16:269:da02:295d:8c92:b202:43ac
1/29/2022 7:27pm 2600:3000:1511:200::31
1/29/2022 7:27pm 2600:3000:1511:200::1e
1/29/2022 7:27pm 2600:1f14:804:fd01:26e9:d143:22f9:90af
1/29/2022 7:27pm 2600:1f14:804:fd00:1a23:ba70:d216:d839
1/29/2022 7:27pm 2600:1f16:269:da01:93df:3a01:5143:6ae0
1/29/2022 7:27pm 2600:1f16:269:da01:93df:3a01:5143:6ae0
1/29/2022 7:27pm 2a05:d014:3ad:701:cace:1ed4:ea8b:49f
1/29/2022 7:27pm 2a05:d014:3ad:702:5e21:33c4:d5b3:ec3a
1/29/2022 7:27pm 2600:3000:1511:200::1d
1/29/2022 7:27pm 2600:1f16:269:da01:93df:3a01:5143:6ae0
1/29/2022 7:27pm 2a05:d014:3ad:701:cace:1ed4:ea8b:49f
1/29/2022 7:27pm 2600:1f14:804:fd01:26e9:d143:22f9:90af
1/29/2022 7:27pm 64.78.149.164
1/29/2022 7:27pm 34.221.255.206
1/29/2022 7:27pm 18.192.36.99
1/29/2022 7:27pm 3.19.56.43
1/29/2022 3:38am 2600:3000:2710:200::30
1/29/2022 3:38am 2600:1f16:269:da00:e45:a547:1761:71
1/29/2022 3:38am 2600:3000:2710:200::1d
1/29/2022 3:38am 2600:3000:2710:200::31
1/29/2022 3:38am 2600:1f14:804:fd00:1a23:ba70:d216:d839
1/29/2022 3:38am 2600:1f14:804:fd02:dcdc:391a:9b83:9c03
1/29/2022 3:38am 2600:1f14:804:fd02:dcdc:391a:9b83:9c03
1/29/2022 3:38am 2600:1f16:269:da02:295d:8c92:b202:43ac
1/29/2022 3:38am 2600:1f16:269:da01:93df:3a01:5143:6ae0
1/29/2022 3:38am 2a05:d014:3ad:702:5e21:33c4:d5b3:ec3a
1/29/2022 3:38am 2a05:d014:3ad:700:2636:9bd6:4525:3c72
1/29/2022 3:38am 2a05:d014:3ad:702:5e21:33c4:d5b3:ec3a
1/29/2022 3:38am 2600:3000:1511:200::1e
1/29/2022 3:38am 2600:1f14:804:fd01:26e9:d143:22f9:90af
1/29/2022 3:37am 2600:1f16:269:da01:93df:3a01:5143:6ae0
1/29/2022 3:37am 2a05:d014:3ad:701:cace:1ed4:ea8b:49f
1/29/2022 3:37am 34.221.255.206
1/29/2022 3:37am 66.133.109.36
1/29/2022 3:37am 3.19.56.43
1/29/2022 3:37am 18.159.196.172
1/28/2022 4:40pm 2600:3000:2710:200::31
1/28/2022 4:40pm 2600:3000:2710:200::1e
1/28/2022 4:40pm 2600:1f14:804:fd01:26e9:d143:22f9:90af
1/28/2022 4:40pm 2600:1f14:804:fd00:1a23:ba70:d216:d839
1/28/2022 4:40pm 2600:3000:2710:200::30
1/28/2022 4:40pm 2600:1f14:804:fd00:1a23:ba70:d216:d839
1/28/2022 4:40pm 2a05:d014:3ad:700:2636:9bd6:4525:3c72
1/28/2022 4:40pm 2600:1f16:269:da02:295d:8c92:b202:43ac
1/28/2022 4:40pm 2600:1f16:269:da02:295d:8c92:b202:43ac
1/28/2022 4:40pm 2a05:d014:3ad:701:cace:1ed4:ea8b:49f
1/28/2022 4:40pm 2600:1f16:269:da00:e45:a547:1761:71
1/28/2022 4:40pm 2a05:d014:3ad:700:2636:9bd6:4525:3c72
1/28/2022 4:40pm 2600:3000:1511:200::1d
1/28/2022 4:40pm 2600:1f14:804:fd01:26e9:d143:22f9:90af
1/28/2022 4:40pm 2600:1f16:269:da01:93df:3a01:5143:6ae0
1/28/2022 4:40pm 2a05:d014:3ad:702:5e21:33c4:d5b3:ec3a
1/28/2022 4:40pm 66.133.109.36
1/28/2022 4:40pm 18.159.196.172
1/28/2022 4:40pm 3.142.122.14
1/28/2022 4:40pm 34.219.87.132
1/28/2022 4:56am 2600:1f14:804:fd00:1a23:ba70:d216:d839
1/28/2022 4:56am 2600:3000:1511:200::30
1/28/2022 4:56am 2600:1f14:804:fd01:26e9:d143:22f9:90af
1/28/2022 4:56am 2600:1f16:269:da01:93df:3a01:5143:6ae0
1/28/2022 4:56am 2600:3000:1511:200::31
1/28/2022 4:56am 2a05:d014:3ad:702:5e21:33c4:d5b3:ec3a
1/28/2022 4:56am 2600:3000:1511:200::1e
1/28/2022 4:56am 2600:1f14:804:fd02:dcdc:391a:9b83:9c03
1/28/2022 4:56am 2600:1f16:269:da00:e45:a547:1761:71
1/28/2022 4:56am 2a05:d014:3ad:700:2636:9bd6:4525:3c72
1/28/2022 4:56am 2600:1f16:269:da00:e45:a547:1761:71
1/28/2022 4:56am 2a05:d014:3ad:700:2636:9bd6:4525:3c72
1/28/2022 4:56am 2600:1f16:269:da02:295d:8c92:b202:43ac
1/28/2022 4:56am 2600:3000:2710:200::31
1/28/2022 4:56am 2600:1f14:804:fd02:dcdc:391a:9b83:9c03
1/28/2022 4:56am 2a05:d014:3ad:700:2636:9bd6:4525:3c72
1/28/2022 4:56am 64.78.149.164
1/28/2022 4:56am 18.116.86.117
1/28/2022 4:56am 34.221.255.206
1/28/2022 4:56am 18.159.196.172
1/27/2022 11:20pm 2600:3000:2710:200::1d
1/27/2022 11:20pm 2600:1f14:804:fd00:1a23:ba70:d216:d839
1/27/2022 11:20pm 2600:3000:2710:200::30
1/27/2022 11:20pm 2600:1f14:804:fd00:1a23:ba70:d216:d839
1/27/2022 11:20pm 2600:3000:2710:200::1e
1/27/2022 11:20pm 2600:1f14:804:fd02:dcdc:391a:9b83:9c03
1/27/2022 11:20pm 2600:1f16:269:da01:93df:3a01:5143:6ae0
1/27/2022 11:20pm 2600:1f16:269:da02:295d:8c92:b202:43ac
1/27/2022 11:20pm 2600:1f16:269:da02:295d:8c92:b202:43ac
1/27/2022 11:20pm 2a05:d014:3ad:702:5e21:33c4:d5b3:ec3a
1/27/2022 11:20pm 2a05:d014:3ad:702:5e21:33c4:d5b3:ec3a
1/27/2022 11:20pm 2a05:d014:3ad:701:cace:1ed4:ea8b:49f
1/27/2022 11:20pm 2a05:d014:3ad:700:2636:9bd6:4525:3c72
1/27/2022 11:20pm 2600:1f14:804:fd00:1a23:ba70:d216:d839
1/27/2022 11:20pm 2600:3000:1511:200::1e
1/27/2022 11:20pm 2600:1f16:269:da00:e45:a547:1761:71
1/27/2022 11:19pm 64.78.149.164
1/27/2022 11:19pm 52.39.4.59
1/27/2022 11:19pm 18.159.196.172
1/27/2022 11:19pm 18.116.86.117
1/27/2022 6:52am 2600:3000:1511:200::1e
1/27/2022 6:52am 2600:3000:1511:200::30
1/27/2022 6:52am 2600:3000:1511:200::30
1/27/2022 6:52am 2600:1f14:804:fd01:26e9:d143:22f9:90af
1/27/2022 6:52am 2a05:d014:3ad:700:2636:9bd6:4525:3c72
1/27/2022 6:52am 2600:1f14:804:fd00:1a23:ba70:d216:d839
1/27/2022 6:52am 2600:1f16:269:da01:93df:3a01:5143:6ae0
1/27/2022 6:52am 2600:1f16:269:da01:93df:3a01:5143:6ae0
1/27/2022 6:52am 2600:1f16:269:da02:295d:8c92:b202:43ac
1/27/2022 6:52am 2600:1f14:804:fd01:26e9:d143:22f9:90af
1/27/2022 6:52am 2a05:d014:3ad:702:5e21:33c4:d5b3:ec3a
1/27/2022 6:52am 2a05:d014:3ad:701:cace:1ed4:ea8b:49f
1/27/2022 6:52am 2600:3000:2710:200::31
1/27/2022 6:52am 2600:1f16:269:da02:295d:8c92:b202:43ac
1/27/2022 6:52am 2600:1f14:804:fd01:26e9:d143:22f9:90af
1/27/2022 6:52am 2a05:d014:3ad:702:5e21:33c4:d5b3:ec3a
1/27/2022 6:52am 64.78.149.164
1/27/2022 6:52am 18.116.86.117
1/27/2022 6:52am 3.120.130.29
1/26/2022 12:21pm 2600:1f14:804:fd00:1a23:ba70:d216:d839
1/26/2022 12:21pm 2600:3000:1511:200::31
1/26/2022 12:21pm 2600:1f14:804:fd01:26e9:d143:22f9:90af
1/26/2022 12:21pm 2600:3000:1511:200::1e
1/26/2022 12:21pm 2600:1f16:269:da00:e45:a547:1761:71
1/26/2022 12:21pm 2600:3000:1511:200::1d
1/26/2022 12:21pm 2600:1f14:804:fd01:26e9:d143:22f9:90af
1/26/2022 12:21pm 2600:1f16:269:da00:e45:a547:1761:71
1/26/2022 12:21pm 2a05:d014:3ad:702:5e21:33c4:d5b3:ec3a
1/26/2022 12:21pm 2600:1f16:269:da02:295d:8c92:b202:43ac
1/26/2022 12:21pm 2a05:d014:3ad:701:cace:1ed4:ea8b:49f
1/26/2022 12:21pm 2a05:d014:3ad:701:cace:1ed4:ea8b:49f
1/26/2022 12:21pm 2600:3000:2710:200::1d
1/26/2022 12:21pm 2600:1f14:804:fd00:1a23:ba70:d216:d839
1/26/2022 12:21pm 2600:1f16:269:da00:e45:a547:1761:71
1/26/2022 12:21pm 2a05:d014:3ad:702:5e21:33c4:d5b3:ec3a
1/26/2022 12:21pm 18.116.86.117
1/26/2022 12:21pm 64.78.149.164
1/26/2022 12:21pm 52.39.4.59
1/26/2022 12:21pm 18.159.196.172
1/26/2022 3:15am 2600:3000:1511:200::31
1/26/2022 3:15am 2600:3000:1511:200::31
1/26/2022 3:15am 2a05:d014:3ad:700:2636:9bd6:4525:3c72
1/26/2022 3:15am 2600:3000:1511:200::1d
1/26/2022 3:15am 2600:1f14:804:fd01:26e9:d143:22f9:90af
1/26/2022 3:15am 2600:1f14:804:fd02:dcdc:391a:9b83:9c03
1/26/2022 3:15am 2600:1f16:269:da02:295d:8c92:b202:43ac
1/26/2022 3:15am 2600:1f14:804:fd00:1a23:ba70:d216:d839
1/26/2022 3:15am 2a05:d014:3ad:700:2636:9bd6:4525:3c72
1/26/2022 3:15am 2600:1f16:269:da01:93df:3a01:5143:6ae0
1/26/2022 3:15am 2a05:d014:3ad:702:5e21:33c4:d5b3:ec3a
1/26/2022 3:15am 2600:3000:1511:200::1e
1/26/2022 3:15am 2a05:d014:3ad:702:5e21:33c4:d5b3:ec3a
1/26/2022 3:15am 2600:1f16:269:da00:e45:a547:1761:71
1/26/2022 3:15am 2600:1f14:804:fd00:1a23:ba70:d216:d839
1/26/2022 3:15am 66.133.109.36
1/26/2022 3:15am 18.159.196.172
1/26/2022 3:15am 34.219.87.132
1/26/2022 3:15am 3.19.56.43
1/25/2022 3:25pm 2600:3000:2710:200::31
1/25/2022 3:25pm 2600:3000:2710:200::1e
1/25/2022 3:25pm 2a05:d014:3ad:701:cace:1ed4:ea8b:49f
1/25/2022 3:25pm 2600:3000:2710:200::31
1/25/2022 3:25pm 2600:1f14:804:fd00:1a23:ba70:d216:d839
1/25/2022 3:25pm 2600:1f14:804:fd01:26e9:d143:22f9:90af
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1/25/2022 3:25pm 2a05:d014:3ad:702:5e21:33c4:d5b3:ec3a
1/25/2022 3:25pm 2a05:d014:3ad:702:5e21:33c4:d5b3:ec3a
1/25/2022 3:25pm 2600:1f16:269:da01:93df:3a01:5143:6ae0
1/25/2022 3:25pm 2600:1f16:269:da00:e45:a547:1761:71
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1/25/2022 3:25pm 2600:3000:2710:200::31
1/25/2022 3:25pm 2600:1f14:804:fd01:26e9:d143:22f9:90af
1/25/2022 3:25pm 2a05:d014:3ad:702:5e21:33c4:d5b3:ec3a
1/25/2022 3:25pm 2600:1f16:269:da00:e45:a547:1761:71
1/25/2022 3:25pm 34.219.87.132
1/25/2022 3:25pm 66.133.109.36
1/25/2022 3:25pm 18.159.196.172
1/25/2022 1:33am 2600:1f14:804:fd00:1a23:ba70:d216:d839
1/25/2022 1:33am 2600:3000:1511:200::31
1/25/2022 1:33am 2600:3000:1511:200::1e
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1/25/2022 1:33am 2600:1f16:269:da02:295d:8c92:b202:43ac
1/25/2022 1:33am 2600:1f14:804:fd02:dcdc:391a:9b83:9c03
1/25/2022 1:33am 2a05:d014:3ad:700:2636:9bd6:4525:3c72
1/25/2022 1:33am 2a05:d014:3ad:700:2636:9bd6:4525:3c72
1/25/2022 1:33am 2a05:d014:3ad:700:2636:9bd6:4525:3c72
1/25/2022 1:33am 2600:1f14:804:fd02:dcdc:391a:9b83:9c03
1/25/2022 1:33am 2600:1f16:269:da02:295d:8c92:b202:43ac
1/25/2022 1:33am 2600:3000:1511:200::31
1/25/2022 1:33am 2a05:d014:3ad:701:cace:1ed4:ea8b:49f
1/25/2022 1:33am 2600:1f16:269:da01:93df:3a01:5143:6ae0
1/25/2022 1:33am 2600:1f14:804:fd00:1a23:ba70:d216:d839
1/25/2022 1:33am 34.219.87.132
1/25/2022 1:33am 18.192.36.99
1/25/2022 1:33am 64.78.149.164
1/25/2022 1:33am 3.142.122.14
No, as you can see in the report of "requests and ip's" the IP is not the same, and it's not mine
Osiris
January 31, 2022, 2:15pm
6
Are all the tokens (the last part of the requested path) the same? Or different every time?
Note that anyone can request a certificate for a certain domain even if that will never succeed. So if I'd continuously request certificates for e.g. letsencrypt.org, the servers of letsencrypt.org will continuously see validation attempts.. Annoying, yes. Harmful, no.
4 Likes
I am not familiar with that log report. Often the IP is the system making the HTTP request to you which would be the Let's Encrypt Server. So, it is not surprising to see different IPs
What does your local Let's Encrypt log folder look like? As I described before
1 Like
The tokens are always the same per domain ... so, I have 4 domains in that host, and I'm receiving always requests like:
https://domain1.com/.well-known/acme-challenge/token1 https://domain2.com/.well-known/acme-challenge/token2 https://domain3.com/.well-known/acme-challenge/token3 https://domain4.com/.well-known/acme-challenge/token4
So, yes always the same tokens ...
Annoying, yes ... because I have monitorized all the 404's and those are all 404, since the .well-known directory does not exists ... it's just created on the fly when certbot needs to renew the cert, and then deleted again.
Osiris
January 31, 2022, 2:25pm
9
If the tokens are always identical, it suggests that a single ACME client is responsible for those attempts. Perhaps a malfunctioning one on your own server, maybe someone else, hard to say.
3 Likes
skiiiks
January 31, 2022, 2:28pm
10
That log is just a CSV taken from my "rollbar.com " report ... just to notice and see the times and ip's of these massive requests.
letsencrypt.log has nothing at all for this last week ... (the time period I sent the logs above)
MikeMcQ
January 31, 2022, 2:39pm
11
Did you try using a different ACME client in addition to Certbot? Maybe it has a faulty cron job or timer running?
If those requests are not from you there is little you can do about it. You cannot block the originating IPs if they are Let's Encrypt servers as they need access to your system to renew your cert.
I think it more likely something is making those requests on your system. You could check you cron log to see if anything runs at those times. As one idea.
3 Likes
The three most frequent causes for this that I've seen are:
The user switched ACME clients, and there is still a crontab running for the old client.
Another user on that machine has a crontab running
The user switched webservers, and there is still an old server/virtual-server running in the cloud that is trying to renew Certbot.
Edit: The best way to bugfix 1&2 is to check the crons for each user, as there may not be anything in the logs.
4 Likes
rg305
January 31, 2022, 5:04pm
13
Those IPs seem legitimate.
5 Likes
MikeMcQ
January 31, 2022, 5:22pm
14
Adding on ... Let's Encrypt production servers make 4 attempts from different IP addresses per domain name http challenge. So, you said you have 4 domains and there were 16 requests in the log you showed (and a couple more as possible comms failure retries). This further indicates that it is related specifically to something you have done rather than some random other person making an attempt.
3 Likes
skiiiks
February 4, 2022, 7:31am
15
It's a completely new host, when I typed all commands
I installed apache2 and then certbot.
So, completely sure there's no more ACME clients, unless certbot does something we don't know.
Commands used related to this topic:
sudo apt-get install apache2
i created the virtualhost.conf manually, and then
sudo certbot --apache
and follow the instructions
Nothing else, nothing more ...
I usually checked the "timer" is running verifying the status with:
sudo systemctl status certbot.timer
That's all I did (I see even in the history log)
9peppe
February 4, 2022, 12:56pm
16
What about the old host? It might be an acme client running there.
4 Likes
system
March 6, 2022, 12:56pm
17
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