Built-in NSG inbound rule at priority 65001 that admits traffic coming from Azure Load Balancer, health probes included.
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In the Ultra Transcenders books
Each book explains AllowAzureLoadBalancerInBound in context, with comparison tables and the common traps.
Terms in this definition
- Default security rules
Built-in NSG rules at priorities 65000-65500: AllowVnetInBound, AllowAzureLoadBalancerInBound and DenyAllInBound, plus AllowVnetOutBound, AllowInternetOutBound and DenyAllOutBound. Removal is impossible; custom rules at 100-4096 take precedence.
- Priority
Routing method in Traffic Manager for active/passive failover: traffic goes to whichever healthy endpoint has the highest priority.
- Azure Load Balancer
Layer-4 load balancer operating within a region, with zone redundancy on the Standard SKU; it has no WAF, doesn't terminate TLS and can't route by URL.