Connection pools are one of the more obvious ways to solve that problem. To avoid the SNAT port problem, you prevent the creation of new connections repetitively to the same host and port. NAT gateway: With a NAT gateway, you have 64k outbound SNAT ports that are usable by the resources sending traffic through it.private endpoints: You don't have a SNAT port restriction to services secured with private endpoints.service endpoints: You don't have a SNAT port restriction to the services secured with service endpoints.connection pools: By pooling your connections, you avoid opening new network connections for calls to the same address and port.There are a few solutions that let you avoid SNAT port limitations. If your app runs out of SNAT ports, it will have intermittent outbound connectivity issues. They're then blocked until a new SNAT port becomes available, either through dynamically allocating more SNAT ports, or through reuse of a reclaimed SNAT port. When applications or functions rapidly open a new connection, they can quickly exhaust their preallocated quota of the 128 ports. The Azure Network load balancer reclaims SNAT port from closed connections only after waiting for 4 minutes. Once a port has been released, the port is available for reuse as needed. The SNAT ports are used up when you have repeated calls to the same address and port combination. If your app creates connections to a mix of address and port combinations, you won't use up your SNAT ports. The SNAT port limit affects opening connections to the same address and port combination. Each instance on Azure App service is initially given a preallocated number of 128 SNAT ports. Azure uses source network address translation (SNAT) and Load Balancers (not exposed to customers) to communicate with public IP addresses.
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