03-24-2019, 09:29 AM
We were scrambling because your app kept dropping connections. Servers looked fine on their end. But the balancer was routing weird. I poked around the portal first. Found the health probes failing silently. Turns out, a firewall rule blocked the checks. Fixed that quick by tweaking the ports. Traffic smoothed out right away.
Or sometimes it's backend pool mismatches. You assign wrong VMs there. I once chased that for hours. Double-checked the IP addresses in the config. Matched them up properly. Boom, balance restored.
Hmmm, another culprit could be public IP issues. If it's not static, things shift unexpectedly. I suggest pinning it down in settings. Test with a simple ping from outside.
But don't overlook NSG rules. They filter traffic harshly sometimes. Review those inbound allows. Make sure your ports stay open for the load.
And quotas might bite you too. Azure caps the balancers per region. I bumped into that once. Requested a limit increase via support ticket. Waited a day, then scaled up.
Or probe timeouts if your app lags. Adjust the interval in the rules. Give it more breathing room. That helped when your database hiccuped.
Public versus internal types differ too. Pick the right one for your needs. I switched from public to internal once for security. Avoided exposing extras.
Finally, logs tell the tale. Enable diagnostics in Azure Monitor. Pull the flow logs. Spot the dropped packets easy.
You might run into SKU differences too. Basic versus Standard has quirks. Standard's more robust for advanced stuff. I upgraded one setup that way.
Troubleshoot systematically like that. Start with basics, then layer deeper.
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