If you happen to needed to dam inbound visitors to your Azure Perform, one choice is to make use of an Entry Restriction. To test if in case you have one, navigate to the Networking blade to your Azure Perform and test if Entry restriction is On.
Determine 1, Entry Restriction and Azure Features
Take warning that though this let’s you block blocks of IP addresses, some IPs are required for performing deployments. A rule like this on the SCM / KUDU website would trigger deployments to fail.
Determine 2, Entry Restriction and Azure Features
Take particular word that for safety causes, the rationale a request is unsuccessful will not be all the time returned to the shopper. If you happen to inform a hacker why their request was blocked, then the would have a greater probability of getting round it. If we don’t know what is obstructing us, then it takes a bit longer. 
