Need help fixing an expired SSL certificate, certificate chain error, hostname mismatch, failed certificate renewal, or other TLS problem?

MisterPKI provides hands-on SSL/TLS certificate consulting, PKI troubleshooting, certificate installation, renewal automation, and certificate lifecycle support for websites, applications, APIs, load balancers, authentication systems, and enterprise infrastructure.

Whether you have an active certificate outage or want to prevent the next one, I can help identify the problem, fix the configuration, and improve the certificate lifecycle so it is less likely to happen again.

Contact info@misterpki.com

SSL Certificate Problems I Can Help Fix

Certificate problems can look simple from the outside—a browser says the connection is not secure—but several different issues can cause the same symptom.

I can help troubleshoot and resolve problems including:

Expired SSL/TLS certificates
SSL certificate renewal failures
Certificate hostname mismatches
Incorrect Subject Alternative Names (SANs)
Broken or incomplete certificate chains
Missing intermediate certificates
Untrusted certificate errors
Incorrect certificate installation
Wrong certificate served by a website or load balancer
ACME validation and renewal failures
Reverse proxy and load balancer TLS issues
Web server certificate configuration
API certificate errors
Certificate deployment problems
Certificate expiration monitoring
Certificate lifecycle automation

If you are not sure which of these is causing the problem, that is part of the troubleshooting process.

Expired SSL Certificate Help

An expired SSL certificate can immediately prevent customers, employees, applications, or integrations from trusting your service.

Depending on the application, an expired certificate can cause:

Browser security warnings
Customers abandoning a website
API connection failures
Authentication failures
Mobile application errors
Failed application integrations
Service interruptions
Monitoring alerts
Emergency certificate replacement work

I can verify the certificate currently being presented by the affected hostname, determine why renewal failed, replace or correctly install the certificate where appropriate, and help determine whether renewal should be automated.

SSL Certificate Chain Errors

A certificate can be current and still fail validation.

One common reason is an incomplete or incorrectly configured certificate chain.

A TLS server normally needs to present the appropriate intermediate CA certificates so that a client can build a trusted path from the server certificate to a trusted root certificate.

Incorrect chain configuration can produce errors such as:

unable to get local issuer certificate
unable to verify the first certificate
Certificate not trusted
Inconsistent behavior between browsers and applications
APIs failing while browsers appear to work
Mobile or embedded clients rejecting the connection

I can inspect the certificate chain being served, identify missing or incorrect intermediates, and help correct the server configuration.

SSL Certificate Hostname Mismatch

A hostname mismatch occurs when the hostname being accessed is not covered by the certificate presented by the server.

For example, a customer may visit:

portal.example.com

while the server presents a certificate valid only for:

www.example.com

Common causes include:

Wrong certificate installed
Missing SAN entry
Load balancer configuration errors
Virtual-host configuration mistakes
DNS changes
Migration to a new server
Multiple applications sharing the same listener

I can identify exactly which certificate is being served and determine where the mismatch is occurring.

SSL Certificate Installation & Configuration

Issuing a certificate is only part of the process.

The certificate must also be installed correctly on the system actually terminating TLS.

That system could be:

Apache
NGINX
IIS
Load balancer
Reverse proxy
Application server
Cloud service
Authentication platform
Network appliance

I can help determine where TLS terminates, verify the certificate and private-key configuration, check the served chain, and confirm the corrected configuration externally after the change.

Certificate Renewal Automation

If a certificate expired because someone forgot to renew or deploy it, simply replacing the certificate solves the outage—but not the underlying process problem.

Where appropriate, I can help automate certificate issuance and renewal using technologies such as ACME.

A reliable certificate-renewal process should address more than issuance. It should also consider:

Domain validation
Certificate retrieval
Secure private-key handling
Deployment
Service reloads
Load balancer updates
Renewal verification
Expiration monitoring
Failure alerting

The goal is not merely to renew certificates automatically.

The goal is to know that the new certificate was successfully deployed and is actually being served.

ACME Consulting & Troubleshooting

ACME can dramatically reduce certificate-management overhead, but failed challenges, DNS configuration, permissions, deployment scripts, proxies, and application-specific behavior can still cause renewal failures.

I can help troubleshoot:

HTTP-01 validation
DNS-01 validation
ACME account configuration
DNS automation
Web server integration
Certificate deployment
Automated reloads
Renewal failures
Post-renewal verification

If your certificate was supposed to renew automatically but still expired, I can help determine where the automation failed.

Certificate Monitoring & Expiration Prevention

Certificate expiration alerts are useful, but an alert that says a certificate should have renewed is not the same as confirming that the new certificate is actually being served.

A better certificate lifecycle process can include:

Certificate inventory
Expiration monitoring
Renewal monitoring
Certificate fingerprint tracking
Live endpoint verification
Chain validation
Hostname validation
Renewal-failure alerts

This is particularly useful for organizations with certificates spread across websites, APIs, load balancers, authentication systems, cloud environments, and infrastructure appliances.

PKI Consulting

Not every certificate problem is limited to a public website.

I also provide consulting around broader Public Key Infrastructure and certificate lifecycle challenges.

Areas can include:

Public and private PKI
Certificate Authorities
Microsoft Certificate Services
Certificate issuance
Certificate renewal
Certificate revocation
CRLs
Certificate lifecycle management
OpenSSL
ACME
Enterprise certificate automation
TLS architecture
Certificate inventory and monitoring
Authentication infrastructure
Certificate-related application integrations

If your issue goes beyond a single website certificate, we can scope the work around the broader PKI environment.

Did I Contact You About a Certificate Problem?

If you arrived here because I contacted your organization about an SSL/TLS certificate issue, I understand that an unsolicited technical email can immediately raise a reasonable question:

How did you find this, and what did you do to our website?

The answer is straightforward.

When a publicly accessible HTTPS service accepts a TLS connection, it presents certificate information to the connecting client. That certificate information is publicly observable as part of the normal HTTPS connection process.

I use publicly accessible TLS information to identify certificate-validation problems such as:

Expired certificates
Hostname mismatches
Broken trust chains

Before contacting an organization, I perform a current check against the affected public hostname to verify that the problem is still present.

I do not attempt to:

Log into your systems
Guess credentials
Bypass authentication
Exploit vulnerabilities
Access private information
Submit forms
Scan internal networks

The purpose of the initial check is simply to determine whether the publicly available TLS service is presenting a certificate problem.

You are welcome to have your existing IT provider independently verify anything I report.

Already Have an IT Department or Managed Service Provider?

That’s completely fine.

You do not need to replace an existing provider to use MisterPKI.

Certificate problems often cross boundaries between:

Web developers
Hosting providers
DNS providers
Network teams
Security teams
Application administrators
Cloud administrators

Sometimes the most valuable thing I can provide is simply determining where the certificate failure actually is.

I can work alongside your:

Internal IT department
Web developer
MSP
Hosting provider
DevOps team
Security team

and provide the PKI/TLS expertise needed to get the problem resolved.

Why Work With MisterPKI?

MisterPKI is focused specifically on practical Public Key Infrastructure, certificates, OpenSSL, TLS, certificate authorities, and certificate lifecycle management.

This is not a general-purpose web design service with SSL added as an upsell.

Certificate infrastructure is the focus.

My professional experience includes work involving:

Enterprise certificate infrastructure
Certificate issuance and renewal
Certificate lifecycle automation
Public and private CAs
Microsoft CA environments
OpenSSL
Authentication infrastructure
SAML and OIDC
Cloud infrastructure
Load balancers
Linux systems
Infrastructure automation
Security architecture

MisterPKI also contains technical articles and practical guides covering the same PKI and OpenSSL technologies I work with professionally.

If you want to evaluate my technical depth before contacting me, you’re encouraged to browse the site.

SSL Certificate Consulting Pricing

Many certificate problems do not require a large consulting engagement.

SSL Certificate Repair

Starting at $100

Appropriate for issues such as:

Expired certificate
Incorrect certificate installation
Missing intermediate certificate
Certificate chain problem
Basic hostname mismatch investigation

TLS & Certificate Troubleshooting

Starting at $150

Appropriate for more involved environments such as:

Reverse proxies
Load balancers
Multiple TLS endpoints
Application servers
Complex certificate chains
Failed automated renewals
Certificate deployment problems

Certificate Renewal Automation

Custom scope

Potential work includes:

ACME configuration
Automated issuance
Automated deployment
DNS validation automation
Renewal verification
Monitoring
Documentation

PKI & Certificate Lifecycle Consulting

Custom scope

Appropriate for broader certificate-management and PKI projects involving multiple systems or enterprise infrastructure.

How the Process Works

1. Identify the affected hostname

Send me the hostname experiencing the problem.

For example:

www.example.com

portal.example.com

api.example.com

2. Confirm the TLS problem

I verify what certificate the endpoint is currently presenting and identify the validation problem.

3. Identify the root cause

Depending on the issue, this may involve certificate validity, certificate chains, DNS, virtual hosts, proxies, load balancers, ACME, or deployment configuration.

4. Correct the problem

We implement the appropriate certificate or configuration change.

5. Verify externally

After the change, I verify the endpoint again from an external TLS client.

6. Prevent recurrence

Where useful, we review renewal automation, monitoring, or certificate lifecycle improvements.

Need SSL Certificate Help Now?

If your website or application is currently presenting a certificate error, send me:

The affected hostname
The certificate error you’re seeing, if available
A brief description of the environment, if known

You do not need to diagnose the problem before contacting me.

info@misterpki.com

Frequently Asked Questions

How much does it cost to fix an expired SSL certificate?

Straightforward certificate problems typically start around $100.

The final cost depends on the environment and whether the problem is simply certificate installation or involves DNS, load balancers, certificate chains, renewal automation, application configuration, or multiple endpoints.

Can you fix an expired SSL certificate remotely?

In many cases, yes.

Certificate troubleshooting, installation, configuration review, and external verification can often be performed remotely.

The exact access required depends on where TLS terminates.

Why is my SSL certificate still showing as expired after renewal?

Common reasons include:

The new certificate was issued but never deployed.
The wrong server was updated.
A load balancer is still serving the old certificate.
A CDN or reverse proxy terminates TLS before the web server.
Multiple servers are presenting different certificates.
The service did not reload after certificate replacement.
DNS directs some clients to an endpoint that still has the old certificate.

I can help determine which certificate the public service is actually presenting and where the stale certificate remains installed.

Why does my SSL certificate work in a browser but fail in an API or application?

One possible cause is an incomplete certificate chain.

Some browsers can recover missing intermediate certificates in ways other TLS clients cannot.

Applications, APIs, command-line tools, mobile applications, and embedded systems may therefore fail even when the website appears normal in a browser.

The actual certificate chain being served should be inspected.

What causes an SSL certificate hostname mismatch?

A hostname mismatch occurs when the requested DNS name is not included in the certificate’s valid names.

This commonly happens after:

Server migrations
DNS changes
Load balancer changes
Certificate replacement
Incorrect SAN configuration
Virtual-host configuration changes

Can SSL certificate renewal be automated?

Often, yes.

ACME and other certificate-management systems can automate issuance and renewal in many environments.

However, a complete automation process should also ensure the certificate is successfully deployed and that the service is actually presenting the replacement certificate.

Can you work with Let’s Encrypt certificates?

Yes.

I can troubleshoot issuance, ACME validation, renewal, deployment, certificate chains, and related TLS configuration.

Can you work with certificates from commercial certificate authorities?

Yes.

TLS troubleshooting principles apply regardless of whether the certificate was issued by Let’s Encrypt or another public CA.

Can you help with Microsoft Certificate Authority environments?

Yes.

MisterPKI consulting can also extend beyond public website TLS into enterprise and private-PKI environments.

Can you help with OpenSSL?

Yes.

OpenSSL is one of the core technologies covered by MisterPKI.

It is useful for certificate inspection, validation, certificate requests, PKI operations, troubleshooting, and many other certificate-management tasks.

Learn More About PKI & OpenSSL

If you’re researching the issue yourself, MisterPKI contains practical guides covering PKI and OpenSSL administration.

Relevant resources include articles about:

OpenSSL certificate commands
Certificate Authorities
Certificate revocation
CRLs
OpenSSL cipher configuration
Certificate Management Protocol
CMS
PKCS#7
Certificate troubleshooting

OpenSSL Commands

Get Help With Your SSL/TLS Certificate

Certificate problems can often be corrected quickly once the actual failure point is identified.

If you’re currently dealing with:

An expired SSL certificate
A certificate chain error
A hostname mismatch
A failed certificate renewal
An ACME issue
A TLS configuration problem
A broader PKI challenge

send me the affected hostname and a brief description of the issue.

info@misterpki.com