DNS hijack or ad-block breaks printer cloud — allowlist vendor domains
Joe B.
Reviewed for technical accuracy
Specialities: Windows/macOS, Printers, Networking, DNS, Ad-blocking (Pi-hole/AdGuard/NextDNS)
Printer cloud blocked by DNS filtering or ad-block — build an allowlist for HP Smart, Epson Connect, Brother, Canon
Technician
Quick triage: which app or service fails — HP Smart, Epson Connect/iPrint, Brother Mobile Connect/iPrint&Scan, or Canon PRINT/PIXMA Cloud Link? Do you see Can’t connect, Sign-in loop, Job stuck in cloud, or AirPrint remote not working off-LAN?
Technician
• DNS hijack/rewrite on the router or ISP CPE forces all queries to its resolver, breaking HTTPS/DoH endpoints used by cloud print/auth.
• Ad-block/Tracking lists (Pi-hole/AdGuard/NextDNS) block telemetry/login/CDN hosts — your app resolves to NXDOMAIN or gets timeouts, so printer cloud jobs fail.
We’ll allowlist vendor domains, disable forced DNS rewrite, and ensure ports (HTTPS 443, IPP over TLS) are open.
Technician
Add wildcards (or exact hosts if your blocker supports them):
• HP Smart / HP cloud:
*.hp.com, *.hpsmart.com, *.hpconnected.com, *.hpcloudprint.com, common CDNs (*.akamaihd.net, *.cloudfront.net) used by updates/auth.• Epson Connect/iPrint:
*.epsonconnect.com, *.epson.net, *.epson.com.• Brother Mobile Connect/iPrint&Scan:
*.brother.com, *.brother.co.jp.• Canon PRINT/PIXMA Cloud Link:
*.canon.com, *.canon.jp.Keep HTTPS 443 open and avoid blocking DoH/DoT the apps might use.
Technician
• Add the vendor wildcards above as allowlist (exact) rules; in NextDNS, use Allowlist → Domain and disable Block newly registered domains for those.
• If you enforce SafeSearch/Parental rewrites, exclude your printer’s IP/MAC and the app devices so DNS isn’t rewritten.
• On AdGuard Home, turn off DNS rewrites for vendor hosts and bypass HTTPS filtering for the apps if you use TLS inspection on the router.
Technician
• Disable “DNS proxy/secure DNS/parental DNS” on the CPE; if not possible, place your own router in front and bridge the ISP box.
• Create firewall rules that block outbound UDP/TCP 53 except to your chosen resolver (or force all to your Pi-hole/AdGuard IP). Avoid redirecting printer traffic mid-stream.
• Allow the apps’ DoH endpoints or disable DoH app-side only if necessary.
Technician
Technician
HP:
*.hp.com, *.hpsmart.com, *.hpconnected.com, *.hpcloudprint.comEpson:
*.epsonconnect.com, *.epson.net, *.epson.comBrother:
*.brother.com, *.brother.co.jpCanon:
*.canon.com, *.canon.jpCDNs/Auth/Realtime occasionally used by apps:
*.akamaihd.net, *.cloudfront.net, *.firebaseio.com, *.googleapis.com
Technician
• Give the printer a static IP or DHCP reservation; avoid captive portal VLANs.
• Exempt printer and app devices from DNS rewrites/strict parental rules; keep ad-block on but with the vendor allowlist.
• Update printer firmware; old TLS stacks fail with modern CDNs.
Technician
Quick answer: the accepted fix
Accepted fix when printer cloud is blocked by DNS or ad-block: build a small allowlist for vendor domains (HP, Epson, Brother, Canon), disable router DNS hijack/rewrite, keep TCP 443 open for app/cloud traffic, and exempt printer/app devices from strict parental filters. Test again on Wi-Fi and cellular.
Why DNS/ad-block breaks printer cloud (NXDOMAIN, TLS, DoH)
DNS filtering can return NXDOMAIN for login/CDN hosts used by HP Smart, Epson Connect, Brother Mobile Connect, and Canon PRINT. DNS hijack on routers rewrites queries, breaking DoH/DoT and IPP over HTTPS. The cure is a focused allowlist plus disabling forced rewrites.
How to verify your allowlist
On the phone app, sign in and send a cloud print; it should leave the queue instantly. From a PC, run nslookup hp.com (replace with your vendor) against your resolver and confirm no NXDOMAIN. In the blocker logs (Pi-hole/AdGuard/NextDNS), vendor domains should show as allowed and the job should complete over HTTPS 443.
Allowlist tips — stay protected without breaking printing
Small scoped allowlist, no blanket exclusions.
Keep your blocklists on; just allow the few vendor/CDN/auth hosts your app needs. Avoid global Disable protection toggles. If you segment networks, place printers on an IoT VLAN but allow TCP 443 egress and mDNS (UDP 5353) within the LAN for discovery.
Disclaimer: This information is AI-generated and intended for general guidance only. For advice specific to your environment, please consult a verified expert on Whizz-Tech before making decisions.
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FAQ
Why does my printer cloud work on LTE but not on home Wi-Fi?
Home routers or blockers may rewrite DNS or block vendor/cloud hosts, causing NXDOMAIN or TLS failures. Allowlist vendor domains and disable router DNS hijack.
Will allowlisting weaken my ad-blocking?
No — a scoped allowlist for HP/Epson/Brother/Canon and required CDNs/Auth keeps protection high while letting cloud print/auth work.
Which ports are required?
Cloud paths use HTTPS 443. Local discovery may use UDP 5353 (mDNS) and printing via TCP 631 (IPP/IPPS) or TCP 9100 (RAW).
Do I need to turn off Pi-hole/AdGuard/NextDNS?
No. Keep them on; just allowlist the vendor domains and exempt your printer/app devices from DNS rewrites or TLS inspection.
How do I stop the router from forcing its DNS?
Disable DNS proxy/parental DNS on the router, or place your own router in front and block outbound port 53 except to your chosen resolver.
| Symptom | Likely cause | Quick fix |
|---|---|---|
| App signs in only on LTE | DNS hijack/parental DNS on router | Disable rewrite; route DNS to Pi-hole/AdGuard; allow HTTPS |
| Cloud jobs stuck | Vendor/CDN hosts blocked (NXDOMAIN) | Allowlist HP/Epson/Brother/Canon + CDNs |
| Printer online but cannot reach cloud | Firewall blocks TCP 443 egress | Permit HTTPS to vendor clouds from printer VLAN |
| AirPrint remote flaky | mDNS disabled; DNS filtering on IoT VLAN | Enable UDP 5353 on-LAN; exempt printer from filters |
Step-by-step (allowlist & DNS hygiene)
- Create an allowlist for vendor clouds: *.hp.com, *.hpsmart.com, *.epsonconnect.com, *.brother.com, *.canon.com (+ CDNs).
- Disable router DNS proxy/hijack or bridge it; enforce DNS to your resolver (Pi-hole/AdGuard/NextDNS).
- Permit TCP 443 egress from printer/app VLANs; keep DoH endpoints allowed if apps use them.
- Give printers a static IP; keep mDNS (UDP 5353) unblocked on the local LAN for discovery.
- Test sign-in and a cloud job; review blocker logs for any residual blocked vendor domains and add to allowlist if needed.
Notes for mixed environments (iOS/macOS/Windows)
- iOS/macOS apps use HTTPS to vendor clouds; don’t intercept TLS for those domains.
- Windows IPP printing may auto-use IPP over TLS; permit 443 even when printing locally.
Sources
- HP Smart — cloud printing & account
- Epson Connect
- Brother Mobile Connect
- Canon Support — cloud/PRINT apps
- AdGuard Home · Pi-hole · NextDNS
Filed under: Printer won’t print
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