How to Solve Let’s Encrypt certificate wget Error

Recently found a strange problem with website use   The free certificate of let’s encrypt is normal when the browser accesses, but an error is reported when WGet. The error information is as follows:


--2021-11-16 13:00:42--
Resolving (
Connecting to (||:443... connected.
ERROR: cannot verify's certificate, issued by ‘/C=US/O=Let's Encrypt/CN=R3’:
  Issued certificate has expired.
To connect to insecurely, use `--no-check-certificate'.

After a wave of online search, I didn’t find any effective solutions. The two methods are effective.

1. Install software

yum install -y ca-certificates

2. Replacement of issuing authority

Because I use the certificate issued by, I use zerossl server by default when issuing the certificate, and I specify it specifically   Let’s encrypt directory server, so just remove the specified server here. Use zereossl as the issuing authority.

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