Canon imageRUNNER E474-0001 — TLS certificate validation failed (scan to email/HTTPS)

Joe B.

Reviewed for technical accuracy

Specialities: Canon imageRUNNER/ADV/DX, Scan to Email, SMTP/TLS, LDAP, WebDAV/FTPS, Microsoft 365 & Google Workspace

Canon imageRUNNER E474-0001 — TLS certificate validation failed on SMTP, WebDAV, LDAP & HTTPS

Technician

Hey! We’ll sort out the Canon imageRUNNER E474-0001 — TLS certificate validation failed error so secure scan and remote services work again.
To target the fix, tell me a few details (you can share them in chat too):
• Which imageRUNNER / imageRUNNER ADV / DX model?
• Does E474-0001 appear on scan to email (SMTP/TLS), LDAP over SSL, WebDAV/FTPS, or when opening the device via HTTPS?
• Are you using Microsoft 365 / Exchange Online, Gmail / Google Workspace, or an on-prem mail/LDAP server?
• Any recent changes: new TLS certificate, moved to OAuth2, forced TLS 1.2+, enabled Confirm TLS Certificate, or changed firewall/proxy?
With that, we can pinpoint if this is a hostname mismatch, expired certificate, missing CA chain, or unsupported security option.

Customer

It’s an imageRUNNER ADV DX. E474-0001 pops up when users scan to email through Microsoft 365. We recently enforced TLS and checked “Confirm TLS Certificate for SMTP TX”. Since then, every scan fails with “TLS certificate validation failed”.

Technician

Got it, that lines up perfectly.
On many Canon imageRUNNER devices, E474-0001 means:
“The machine tried to verify the TLS server certificate and something did not pass validation.”
Typical causes when you enable Confirm TLS Certificate for SMTP/LDAP/WebDAV:
• The server’s certificate CN/hostname doesn’t match what the machine connects to.
• The certificate chain is signed by a CA that is not installed in the imageRUNNER’s trusted CA store.
• The certificate is expired, not yet valid, or intermediate CA is missing.
• The device time is wrong, so TLS validation thinks the cert is invalid.
• You forced modern ciphers/FIPS or TLS versions that don’t match the mail server’s supported suite.

Good news: E474-0001 is usually fixed by correcting server name + TLS port, importing the right root/intermediate CA certificates, and adjusting the Confirm TLS Certificate options — no hardware swap.

Customer

That makes sense. We’re using smtp.office365.com with port 587 and STARTTLS. The error only started after we enabled “Confirm TLS Certificate for SMTP TX”. Before that it worked.

Technician

Perfect, that’s a common secure setup — we just need the details right.
Step 1 — Basic checks for Canon E474-0001 with Microsoft 365/Gmail
1) Server name: Make sure you’re using the official FQDN (smtp.office365.com or the recommended host), not an IP. TLS certificate validation fails if the certificate CN/SAN does not match the host you entered.
2) Port & encryption: For Microsoft 365 use port 587 + STARTTLS, not SSL on 465. For Google Workspace, also confirm STARTTLS/ports per Google’s docs.
3) Device date/time: Ensure the imageRUNNER time, date, and time zone are correct or synced via NTP. If the clock is off, the machine treats valid certificates as expired/not yet valid and throws E474-0001 TLS certificate validation failed.
4) Confirm CN option: If “Add CN to Verification Items” is enabled, the device will strictly compare the server name to the certificate. Any typo, alias, or IP will break TLS verification.
Let’s fix these first — they solve a huge chunk of E474-0001 cases.

Customer

Server is smtp.office365.com, port 587, STARTTLS. Time is synced. E474-0001 is still there as long as “Confirm TLS Certificate for SMTP TX” is on. Turn it off and mail works, but we’d like to keep it secure.

Technician

Great, you’re close — now we handle trust anchors.
Step 2 — Install the correct root & intermediate CA certificates
When Confirm TLS Certificate is enabled, the Canon checks the server’s certificate chain against its internal CA store.
• If your mail provider (like Microsoft 365 or Google) uses a CA not in the device’s default list, you’ll see E474-0001 until you import the appropriate root and intermediate CA certificates.
• For on-prem Exchange, custom SMTP relays, WebDAV, FTPS or LDAP over SSL using a self-signed certificate, you must export that certificate (or its CA) and upload it to the imageRUNNER as a trusted CA.

On most models:
1) Log into the Remote UI via HTTPS.
2) Go to Settings/Registration → Security → Certificate Settings → CA Certificate (wording varies slightly).
3) Import the current public CA chain used by your SMTP/LDAP/WebDAV server.
4) Reboot if prompted, then test scan to email again with “Confirm TLS Certificate” still enabled.
This keeps TLS verification ON (no security downgrade) while eliminating the E474-0001 error.

Customer

We also use LDAPS and WebDAV for address books and scan-to-folder. After enabling “Confirm TLS Certificate for Network Access” those started failing too with the same TLS validation message.

Technician

Yep, that’s expected once you enforce certificate checks globally.
Step 3 — Fix E474-0001 for LDAP over SSL, WebDAV, FTPS
For each secure service (LDAPS, HTTPS file server, WebDAV, FTPS):
• Make sure the server address on the Canon exactly matches the certificate CN/SAN (e.g. ldap.company.com, not raw IP).
• Confirm the TLS version and ciphers are compatible; if you enabled FIPS or restricted suites on the device, verify the server supports them.
• If using internal PKI or self-signed certificates, export the issuing CA cert and import it into the imageRUNNER’s CA store.
• If you recently renewed the certificate, import the new chain; old cached roots may no longer validate it.

Once each external server’s certificate chain is trusted, E474-0001 TLS certificate validation failed stops appearing and all secure lookups/transfers resume.

Customer

Is it okay if we just disable “Confirm TLS Certificate” to get rid of E474-0001? Or is that a bad idea from a security standpoint?

Technician

Good you’re asking — this is where many environments quietly weaken security.
• Turning off Confirm TLS Certificate (or “Verify Server Certificate”) usually makes E474-0001 go away, but it allows encrypted connections to untrusted or spoofed servers.
• For regulated sectors (legal, healthcare, finance, education, government) that’s not acceptable. You want TLS certificate validation enabled plus the correct CA chain.

Recommended approach:
1) Keep TLS enabled for SMTP/LDAP/WebDAV/FTPS.
2) Keep Confirm TLS Certificate ON for production servers once CA imports are correct.
3) Use a separate, clearly labeled profile if you must temporarily relax verification for testing.
If you’d like help balancing “works reliably” with “passes audits”, we can map your exact requirements in a couple of messages.

Customer

Understood. One more: can E474-0001 also be triggered by TLS version or cipher issues? Our security team forced TLS 1.2+ and some FIPS options on the copier.

Technician

Yes, in some firmware builds a failed TLS handshake (protocol/cipher mismatch) surfaces as a certificate validation failed style message.
Step 4 — Check TLS / FIPS compatibility
• If you enabled “Format Encryption Method to FIPS 140” or restricted cipher suites, confirm your SMTP/LDAP/WebDAV servers support those algorithms.
• Ensure TLS 1.2 is supported end-to-end; if your device is older, install the latest Canon firmware so it can talk securely to modern services.
• If tightening policies instantly triggered E474-0001 on multiple services, relax one notch (while keeping TLS enabled) or align server-side settings accordingly.
We can review your exact combination and suggest a compliant-but-working TLS policy instead of trial-and-error.

Customer

Okay, so to summarize we should: match hostnames, import CA chain, check time, review TLS/FIPS, and keep verification on. If we struggle, can you walk our admin through it remotely?

Technician

Exactly — that’s the right checklist.
Summary: To clear Canon imageRUNNER E474-0001 TLS certificate validation failed without disabling security:
• Use the correct FQDN and ports for SMTP/LDAP/WebDAV/FTPS/HTTPS.
• Fix device date/time and NTP.
• Import the proper root and intermediate CA certificates (or your self-signed/PKI CA) into the machine.
• Keep Confirm TLS Certificate enabled once trust is configured.
• Align TLS/FIPS settings with what your mail and directory servers support.

Want someone to validate every setting and provide screenshots for your exact model? Open the chat and an Expert will walk your admin through a secure, working configuration.

Quick answer: the accepted fix

Accepted fix when a Canon imageRUNNER shows E474-0001 “TLS certificate validation failed”: verify correct SMTP/LDAP/WebDAV/FTPS hostnames and ports, fix the device time, import the proper root/intermediate or self-signed CA certificates into the machine, then keep Confirm TLS Certificate enabled so scan to email and secure services work with full TLS validation.

FAQ

Step-by-step checklist for Canon imageRUNNER E474-0001

1. Note where E474-0001 TLS certificate validation failed appears (SMTP, LDAP, WebDAV, FTPS, HTTPS).
2. Confirm you are using vendor-documented FQDNs and ports (e.g., smtp.office365.com:587 with STARTTLS).
3. Verify the device’s date, time, and time zone and configure NTP if available.
4. Export the mail/LDAP/WebDAV server’s root and intermediate CA certificates and import them into the Canon CA store.
5. Keep Confirm TLS Certificate / Verify Server Certificate enabled and retest scan to email and directory lookups.
6. If errors persist, review TLS/FIPS settings and update firmware; escalate to an expert if the certificate chain and settings appear correct.

Note for mixed environments (Windows/macOS/Linux)

1. E474-0001 is generated by the imageRUNNER itself; changing desktop drivers will not resolve it.
2. Once TLS and certificates are fixed on the device, scan to email and secure services work from all platforms without extra client changes.

Sources

• Canon — Verifying TLS server certificates (Confirm TLS Certificate options)
• Canon — Send settings (Confirm TLS Certificate for SMTP/POP/WebDAV/FTPS)
• Canon — Configuring the key and certificate for TLS on imageRUNNER

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