Common Azure Cloud Issues and How to Fix Them: A Practical Guide

Azure is a robust cloud platform, but users often encounter some recurring issues. This guide covers common Azure problems and straightforward solutions to help you troubleshoot effectively.

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1. Unable to Connect to Azure Virtual Machine (VM) via RDP or SSH

Issue:

You cannot connect to your Azure VM using Remote Desktop Protocol (RDP) or SSH.

Common Causes:

• Network Security Group (NSG) rules blocking traffic

• Incorrect public IP or DNS name

• VM not running or stopped

• RDP/SSH service not running inside VM

Fix Steps:

1. Check NSG Inbound Rules

   • Navigate to Azure Portal > Virtual Machines > Your VM > Networking tab.

   • Verify that inbound rules allow port 3389 for RDP or 22 for SSH from your IP.

2. Verify Public IP Address or DNS Name

   • Ensure you are connecting to the correct IP or fully qualified domain name (FQDN).

3. Check VM Status

   • VM must be in Running state.

4. Reset RDP/SSH Configuration

   • Use Azure Portal’s “Reset password” option to reset RDP/SSH configuration or password.

5. Restart VM

   • Sometimes a reboot helps restore connectivity.

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2. Azure Storage Account Access Denied

Issue:

Access to Azure Blob or File storage is denied.

Common Causes:

• Incorrect Storage Account Access Keys or SAS tokens

• Missing or insufficient RBAC permissions

• Firewall rules blocking access

Fix Steps:

1. Verify Access Keys or SAS Tokens

   • Azure Portal > Storage Account > Access keys or Shared access signature (SAS).

   • Use the correct keys or tokens.

2. Check Role-Based Access Control (RBAC)

   • Ensure your user/service principal has required permissions like Storage Blob Data Contributor.

3. Firewall and Virtual Network Settings

   • If firewall is enabled on the storage account, whitelist your IP or virtual network.

4. Test Access Using Azure Storage Explorer

   • Connect using Storage Explorer tool to confirm permissions.

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3. Azure Function App Failing or Timing Out

Issue:

Azure Functions are failing to execute or timing out.

Common Causes:

• Timeout settings too low

• Resource limits hit (memory, CPU)

• External service dependencies slow or unavailable

Fix Steps:

1. Increase Function Timeout

   • For Consumption plan: max timeout is 10 minutes (default 5 min). Use host.json to adjust.

   • For Premium/Dedicated plans: timeout can be unlimited.

2. Optimize Function Code

   • Review code to improve efficiency and reduce long-running operations.

3. Monitor Function Metrics

   • Use Azure Monitor and Application Insights for detailed logs and metrics.

4. Check Dependencies

   • Ensure any called APIs or services are responsive and available.

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4. Cannot Connect to Azure SQL Database

Issue:

Unable to connect to Azure SQL Database from client applications.

Common Causes:

• Firewall rules blocking client IP

• Incorrect connection strings or credentials

• Database server paused (for serverless tiers)

Fix Steps:

1. Configure Firewall Rules

   • Azure Portal > SQL Server > Firewall and virtual networks.

   • Add your client IP address or enable “Allow Azure services and resources to access this server”.

2. Verify Connection String

   • Use the correct server name, database name, username, and password.

3. Check Database Status

   • Ensure database is online and not paused (if serverless tier).

4. Test Connection Using SQL Server Management Studio (SSMS)

   • Try connecting with SSMS to isolate the issue.

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5. Azure Load Balancer Backend Pool Showing Unhealthy

Issue:

Instances in the backend pool are marked unhealthy.

Common Causes:

• Incorrect health probe configuration

• Network Security Group blocking probe traffic

• Application not responding to health checks

Fix Steps:

1. Verify Health Probe Settings

   • Azure Portal > Load Balancer > Health probes.

   • Check the probe path, protocol, port, and interval.

2. Check NSG Rules

   • Ensure NSG allows inbound traffic on the health probe port from the Load Balancer.

3. Validate Application Health Endpoint

   • Confirm your app responds with expected status codes.

4. Manual Probe Test

   • Use curl or browser to test the probe URL on the backend instances.

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Conclusion

Azure offers a wide range of services, but troubleshooting requires clear, methodical steps. Always verify network security, access permissions, and service status first. Use Azure Portal’s monitoring and diagnostic tools for deeper insights.