wget's certificate verification errors generally trace back to the same causes as curl's — either wget's configured CA bundle is outdated or missing, or the remote server's certificate chain genuinely has a problem.
Diagnosing
wget --ca-certificate=/path/to/updated-cacert.pem https://yourdomain.comTesting with an explicitly specified, known-current CA bundle helps isolate whether the issue is wget's own configuration versus the remote server's certificate — if it still fails with a known-good bundle, the problem is on the server side.
What wget's specific error output typically reveals
wget's certificate error output is generally more terse than curl's, but follows the same underlying categories — checking wget's specific error message against the broader categories covered in our curl error guide (chain, hostname, expiry) applies the same diagnostic logic despite the different tool.
How to specify a custom CA certificate file with wget specifically
Adding the --ca-certificate flag with a path to a specific CA certificate file lets wget validate against a particular trust source, useful for testing against an internal or private CA without needing to modify your system's broader trust store.
What the --no-check-certificate flag actually does and why to avoid it in production
This flag completely disables certificate verification for the request, which might seem like a quick fix but removes TLS's core security guarantee entirely — appropriate only for genuinely trusted, temporary local testing, never as a routine production workaround for an underlying certificate issue that should actually be fixed.
How wget's error handling compares to curl's for the same underlying certificate problem
wget and curl both ultimately rely on similar underlying TLS libraries and report conceptually equivalent categories of certificate failure, though with different specific wording and flag names for equivalent options (--ca-certificate for wget versus --cacert for curl) — the underlying diagnostic approach transfers directly between them.
A final note for automated scripts and cron jobs
For any automated script or cron job using wget against HTTPS endpoints, confirming certificate verification remains enabled (rather than having been disabled at some point as a quick fix) is worth periodically auditing, since a disabled verification setting can persist unnoticed for a long time in unattended automation.
What the exact wget flag syntax looks like for specifying a custom CA certificate
Running wget --ca-certificate=/path/to/ca.pem https://yourdomain.com lets wget validate against a specific trust source you provide, useful for testing against an internal or private CA without needing to modify your system's broader, shared trust configuration.
How wget's behavior differs slightly across different operating systems and versions
wget versions bundled with different Linux distributions can be compiled against different underlying SSL/TLS libraries with slightly different default behaviors — checking your specific wget version (wget --version) against its documentation helps explain any behavior that seems inconsistent with what's described in general wget guidance found online.
A quick closing checklist
A quick closing checklist covers checking the specific error against the broader categories covered in our curl error guide, using --ca-certificate for legitimate custom trust needs, and never using --no-check-certificate as a routine production workaround.
Why automation scripts deserve particular scrutiny for accidentally disabled verification
Because --no-check-certificate is a tempting quick fix when a script is failing and needs to work immediately, automation and cron scripts are particularly prone to accumulating this dangerous workaround over time — periodically auditing scripts for this specific flag is a worthwhile security hygiene practice.