Remix runs a real server on every deployment.
That server's SSL certificate breaks everything when it expires.
Remix's server-side rendering means every client deployment runs a persistent server on Fly.io, Railway, Render, or Cloudflare Workers. Unlike static frameworks where CDN caching can mask DNS breaks for hours, a Remix server SSL failure takes down the application immediately — page loads, form submissions, webhooks, and API consumers all fail at once. Merlonix monitors SSL and DNS so you know 30 days before expiry.
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- Check cadence (Agency)
- 5 min
- SSL pre-expiry alert
- 30 days
- Independent DNS resolvers
- 3
- Vendors watched
- 11
Where Remix agencies get caught out
Three failure modes specific to Remix full-stack client deployments.
Remix agencies managing full-stack client deployments on Fly.io, Railway, Render, and Cloudflare Workers deal with total-outage SSL expiry, platform migration CNAME residue, and Workers custom domain SSL separate from Pages projects.
Remix server SSL expiry takes down pages, forms, and webhooks simultaneously
A Remix application SSL certificate expiry is a total outage — not a partial failure — because the server handles every request type from a single endpoint
Remix is a full-stack framework: the same server handles page requests, form submissions, loader data fetching, and resource routes used by webhooks and API consumers. Unlike static or SPA frameworks where the frontend can continue loading from CDN cache while a backend service breaks independently, a Remix server SSL failure is immediate and total. When the SSL certificate on a Fly.io app, Railway service, or Render web service expires, every request to the application fails with an SSL handshake error simultaneously. The client application goes completely dark — not just the API, not just the dynamic sections, but every page load and every background integration. The blast radius of a Remix SSL expiry is larger than almost any other framework.
Platform migrations leave dangling CNAME records
Moving a Remix client from Fly.io to Railway or Render adds a new CNAME but the old platform's custom domain registration keeps the previous CNAME active
Remix agencies migrate client applications between platforms as hosting costs, performance requirements, or operational preferences change. Moving from Fly.io to Railway involves provisioning a new service, deploying the Remix application, configuring a custom domain on the new platform, and updating the DNS CNAME to point at the new host. The previous platform — Fly.io — still has the custom domain registered in its configuration. The old CNAME may still resolve to the Fly.io app infrastructure for some time, depending on how the platform handles deregistered custom domains. If the Fly.io custom domain is not explicitly removed, the old CNAME entry in the client's DNS can conflict with or shadow the new Railway CNAME during DNS propagation. After the Fly.io app is eventually decommissioned, the old CNAME becomes a dangling record that will eventually resolve to an error or to a different tenant.
Remix on Cloudflare Workers requires custom domain SSL separate from Pages
Remix applications deployed to Cloudflare Workers with the Cloudflare adapter configure custom domains on a Worker route — not a Pages project — with independent SSL provisioning
Remix agencies deploying with the Cloudflare Workers adapter configure custom domains directly on the Worker, not on a Cloudflare Pages project. Worker custom domains use Cloudflare's Universal SSL provisioned for the Worker route, distinct from any Pages project SSL. The Worker custom domain requires a CNAME pointing the client domain at the Worker's default *.workers.dev hostname. When the CNAME is misconfigured or the Worker is redeployed to a new name without migrating the custom domain route, the SSL provisioning for the Worker custom domain fails. The client's domain resolves to a Cloudflare page rather than the Remix application. Because the resolution still succeeds — Cloudflare responds — standard uptime monitoring may not catch the routing failure until a human notices the wrong content is being served.
How it works
SSL and DNS monitoring for Remix full-stack applications across every platform.
Merlonix monitors CNAME integrity and SSL health for Remix applications on Fly.io, Railway, Render, and Cloudflare Workers — with 30-day expiry warnings before a server SSL failure becomes a total client outage.
01
Add the application domain, staging, and any legacy platform CNAMEs
Verify ownership with a DNS TXT record on the apex domain. Staging environments, legacy platform CNAMEs from prior migrations, and Remix on Workers custom domain routes are added without additional verification. Monitoring legacy records catches platform decommission problems before they surface as client errors. Under two minutes per client to get full coverage.
02
CNAME integrity checks on every platform target
Three independent DNS resolvers check every CNAME delegation on every monitoring interval — whether the target is a Fly.io app hostname, a Railway service URL, a Render web service, or a Cloudflare Worker default hostname. When a platform migration leaves a conflicting old CNAME, the target mismatch is detected immediately. When a Worker is redeployed and the custom domain loses its routing, the break is detected before a client reports it.
03
SSL monitoring 30 days before the total-outage expiry
Full SSL chain validation on every Remix application domain. An expiry alert fires 30 days before the certificate expires — enough lead time to renew before a Remix server SSL failure causes a total application outage. Fly.io, Railway, Render, and Cloudflare Workers each have their own certificate management behavior; Merlonix monitors the certificate regardless of which platform provisions it.
04
Vendor status for Fly.io, Railway, Render, and Cloudflare
Merlonix monitors Fly.io, Railway, Render, and Cloudflare platform status alongside client SSL and DNS. When a Fly.io infrastructure incident causes application SSL failures across multiple Remix client deployments, you see the vendor event — not a cascade of individual client alerts requiring separate investigation.
What the numbers mean for Remix agencies
Monitoring built for Remix full-stack agencies where SSL expiry means total outage.
Remix agencies managing full-stack client deployments on server-based platforms need SSL monitoring with enough lead time to act before expiry — because there is no CDN cache to soften the failure when a Remix server certificate expires.
< 10 min
Time from DNS change to alert — catches Remix platform migration CNAME residue and Workers custom domain routing breaks before clients notice
30 days
SSL expiry warning lead time — enough time to renew before a Remix server SSL expiry causes a total application outage across pages, forms, and webhooks
11 vendors
Upstream services monitored — Cloudflare and Fly.io included to distinguish platform incidents from client DNS changes on Remix deployments
200 assets
Maximum monitored domains on the Agency plan — covers production, staging, and legacy platform CNAMEs across a full Remix client roster
Pricing
Flat monthly fee. Every server deployment and staging environment included.
No per-domain charges. No per-platform fees. Pick the tier that fits your Remix client count and monitor every server deployment without billing surprises.
Starter
For individual Remix developers managing a small full-stack client portfolio.
$29/ month
- 10 monitored assets
- 1 seat
- 15-min check cadence
- SSL + DNS + vendor monitoring
- Email + Slack alerts
Team
For Remix agencies managing full-stack client deployments across Fly.io, Railway, and Cloudflare.
$79/ month
- 50 monitored assets
- 5 seats
- 10-min check cadence
- SSL + DNS + vendor monitoring
- Email + Slack alerts
Agency
For agencies with a full Remix client roster across multiple server-based hosting platforms.
$199/ month
- 200 monitored assets
- 15 seats
- 5-min check cadence
- SSL + DNS + vendor monitoring
- Email + Slack alerts
Know when a Remix server certificate is about to expire — before the total outage.
Add your first Remix client domain in under two minutes. Server applications on Fly.io, Railway, Render, and Cloudflare Workers are monitored from the same dashboard. 14-day trial, no card required.