So, you've set up your SRV (Service) records, but things aren’t working as expected?
Maybe your application isn’t connecting, or your VoIP system is failing. No worries—we’re here to troubleshoot and resolve the issue step by step.
Step 1: First, What’s an SRV Record?
SRV records tell services (like SIP, XMPP, or LDAP) where to connect by specifying:
✅ The service name (e.g., _sip._tcp.example.com)
✅ The target server handling the service
✅ The priority and weight to decide which server to connect to first
If your SRV record isn’t working, there could be several reasons. Let’s go through them!
Step 2: Common SRV Record Issues & Fixes
| Issue | Possible Cause | How to Fix |
|---|---|---|
| SRV Record Not Found | The record might not be added or propagated | Double-check your DNS settings and wait for propagation (can take up to 48 hours) |
| Incorrect Service Name | The prefix (_sip, _xmpp) might be missing | Ensure the service is correctly formatted, like _sip._tcp.example.com |
| Misconfigured Target Server | Wrong hostname or no A/AAAA record for the target | Ensure the target server has a valid A or AAAA record |
| Wrong Priority & Weight | The wrong values may cause service failures | Adjust values based on service recommendations |
| Firewall or ISP Blocking Requests | Firewalls may be preventing traffic | Whitelist necessary ports for the service (e.g., 5060 for SIP) |
Step 3: How to Check SRV Records?
🔍 Online DNS Lookup Tools
You can check your SRV records using:
- MXToolbox
- Google Admin Toolbox
- YourDMARC SRV Lookup Tool
Just enter your domain, and these tools will show your SRV record details.
🖥️ Command Line Method
For those who prefer manual checks:
Windows (Command Prompt):
cmdCopyEditnslookup -type=SRV _sip._tcp.example.com
Mac/Linux (Terminal):
bashCopyEditdig SRV _sip._tcp.example.com
This will return the configured SRV records.
Step 4: Still Not Working? Additional Fixes
✔ Check TTL (Time-To-Live): If the TTL is too high, updates might take longer to reflect. Lower it temporarily.
✔ Confirm Port Settings: Ensure the correct port is set in your service.
✔ Ensure No Conflicting Records: Sometimes, multiple SRV records can cause conflicts.
FAQs
💡 Can I have multiple SRV records for the same service? Yes! They work together based on priority and weight.
💡 How long does it take for SRV records to update? It depends on your DNS provider, but usually within 24–48 hours.
💡 Why is my SRV record ignored? Some applications require explicit SRV support—check your app’s documentation.
Final Thoughts
SRV record issues can be frustrating, but with the right checks, they can be fixed quickly. If you're struggling with persistent issues, YourDMARC can help analyze and optimize your DNS records for smooth performance.
🚀 Need expert insights? Try YourDMARC for seamless DNS monitoring and troubleshooting!
