diff --git a/Cargo.lock b/Cargo.lock
index cd3ec73bcc..f8d4fd3730 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -762,6 +762,23 @@ dependencies = [
  "winapi-util",
 ]
 
+[[package]]
+name = "console"
+version = "0.12.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c0b1aacfaffdbff75be81c15a399b4bedf78aaefe840e8af1d299ac2ade885d2"
+dependencies = [
+ "encode_unicode",
+ "lazy_static",
+ "libc",
+ "regex",
+ "terminal_size",
+ "termios",
+ "unicode-width",
+ "winapi 0.3.9",
+ "winapi-util",
+]
+
 [[package]]
 name = "const-random"
 version = "0.1.8"
@@ -985,6 +1002,7 @@ dependencies = [
  "libflate",
  "mockall",
  "mockito",
+ "net2",
  "petgraph",
  "proptest",
  "rand 0.7.3",
@@ -1107,9 +1125,9 @@ checksum = "134951f4028bdadb9b84baf4232681efbf277da25144b9b0ad65df75946c422b"
 
 [[package]]
 name = "either"
-version = "1.5.3"
+version = "1.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bb1f6b1ce1c140482ea30ddd3335fc0024ac7ee112895426e0a629a6c20adfe3"
+checksum = "cd56b59865bce947ac5958779cfa508f6c3b9497cc762b7e24a12d11ccde2c4f"
 
 [[package]]
 name = "ena"
@@ -1475,9 +1493,9 @@ dependencies = [
 
 [[package]]
 name = "hashbrown"
-version = "0.8.1"
+version = "0.8.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "34f595585f103464d8d2f6e9864682d74c1601fed5e07d62b1c9058dba8246fb"
+checksum = "e91b62f79061a0bc2e046024cb7ba44b08419ed238ecbd9adbd787434b9e8c25"
 dependencies = [
  "autocfg 1.0.0",
 ]
@@ -1691,7 +1709,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "86b45e59b16c76b11bf9738fd5d38879d3bd28ad292d7b313608becb17ae2df9"
 dependencies = [
  "autocfg 1.0.0",
- "hashbrown 0.8.1",
+ "hashbrown 0.8.2",
 ]
 
 [[package]]
@@ -1700,7 +1718,7 @@ version = "0.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8572bccfb0665e70b7faf44ee28841b8e0823450cd4ad562a76b5a3c4bf48487"
 dependencies = [
- "console 0.11.3",
+ "console 0.12.0",
  "lazy_static",
  "number_prefix",
  "regex",
@@ -1844,9 +1862,9 @@ checksum = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
 
 [[package]]
 name = "lazycell"
-version = "1.2.1"
+version = "1.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b294d6fa9ee409a054354afc4352b0b9ef7ca222c69b8812cbea9e7d2bf3783f"
+checksum = "830d08ce1d1d941e6b30645f1a0eb5643013d835ce3779a5fc208261dbe10f55"
 
 [[package]]
 name = "leb128"
@@ -2353,7 +2371,7 @@ dependencies = [
  "instant",
  "libc",
  "redox_syscall",
- "smallvec 1.4.1",
+ "smallvec 1.4.2",
  "winapi 0.3.9",
 ]
 
@@ -3043,9 +3061,9 @@ checksum = "388a1df253eca08550bef6c72392cfe7c30914bf41df5269b68cbd6ff8f570a3"
 
 [[package]]
 name = "serde"
-version = "1.0.114"
+version = "1.0.115"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5317f7588f0a5078ee60ef675ef96735a1442132dc645eb1d12c018620ed8cd3"
+checksum = "e54c9a88f2da7238af84b5101443f0c0d0a3bbdc455e34a5c9497b1903ed55d5"
 dependencies = [
  "serde_derive",
 ]
@@ -3082,9 +3100,9 @@ dependencies = [
 
 [[package]]
 name = "serde_derive"
-version = "1.0.114"
+version = "1.0.115"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2a0be94b04690fbaed37cddffc5c134bf537c8e3329d53e982fe04c374978f8e"
+checksum = "609feed1d0a73cc36a0182a840a9b37b4a82f0b1150369f0536a9e3f2a31dc48"
 dependencies = [
  "proc-macro2 1.0.19",
  "quote 1.0.7",
@@ -3223,9 +3241,9 @@ dependencies = [
 
 [[package]]
 name = "smallvec"
-version = "1.4.1"
+version = "1.4.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3757cb9d89161a2f24e1cf78efa0c1fcff485d18e3f55e0aa3480824ddaa0f3f"
+checksum = "fbee7696b84bbf3d89a1c2eccff0850e3047ed46bfcd2e92c29a2d074d57e252"
 
 [[package]]
 name = "socket2"
@@ -3661,9 +3679,9 @@ checksum = "e987b6bf443f4b5b3b6f38704195592cca41c5bb7aedd3c3693c7081f8289860"
 
 [[package]]
 name = "tracing"
-version = "0.1.18"
+version = "0.1.19"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f0aae59226cf195d8e74d4b34beae1859257efb4e5fed3f147d2dc2c7d372178"
+checksum = "6d79ca061b032d6ce30c660fded31189ca0b9922bf483cd70759f13a2d86786c"
 dependencies = [
  "cfg-if",
  "log",
@@ -3672,9 +3690,9 @@ dependencies = [
 
 [[package]]
 name = "tracing-core"
-version = "0.1.13"
+version = "0.1.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d593f98af59ebc017c0648f0117525db358745a8894a8d684e185ba3f45954f9"
+checksum = "db63662723c316b43ca36d833707cc93dff82a02ba3d7e354f342682cc8b3545"
 dependencies = [
  "lazy_static",
 ]
diff --git a/e2e/bats/bootstrap.bash b/e2e/bats/bootstrap.bash
index 8a08648aac..0d1df0343c 100644
--- a/e2e/bats/bootstrap.bash
+++ b/e2e/bats/bootstrap.bash
@@ -18,10 +18,10 @@ teardown() {
     dfx build
     dfx canister install hello
     ID=$(dfx canister id hello)
-
-    assert_command curl http://localhost:8000/_/candid?canisterId="$ID" -o ./web.txt
+    PORT=$(cat .dfx/webserver-port)
+    assert_command curl http://localhost:"$PORT"/_/candid?canisterId="$ID" -o ./web.txt
     assert_command diff .dfx/local/canisters/hello/hello.did ./web.txt
-    assert_command curl http://localhost:8000/_/candid?canisterId="$ID"\&format=js -o ./web.txt
+    assert_command curl http://localhost:"$PORT"/_/candid?canisterId="$ID"\&format=js -o ./web.txt
     # Relax diff as it's produced by two different compilers.
     assert_command diff --ignore-all-space --ignore-blank-lines .dfx/local/canisters/hello/hello.did.js ./web.txt
 }
diff --git a/e2e/bats/build.bash b/e2e/bats/build.bash
index c6a8676897..15b4025887 100644
--- a/e2e/bats/build.bash
+++ b/e2e/bats/build.bash
@@ -93,7 +93,8 @@ teardown() {
 @test "build succeeds when requested network is configured" {
     dfx_start
 
-    assert_command dfx config networks.tungsten.providers '[ "http://127.0.0.1:8000" ]'
+    webserver_port=$(cat .dfx/webserver-port)
+    assert_command dfx config networks.tungsten.providers '[ "http://127.0.0.1:'$webserver_port'" ]'
     assert_command dfx canister --network tungsten create --all
     assert_command dfx build --network tungsten
 }
@@ -108,7 +109,8 @@ teardown() {
 
 @test "build output for non-local network is in expected directory" {
   dfx_start
-  assert_command dfx config networks.tungsten.providers '[ "http://127.0.0.1:8000" ]'
+  webserver_port=$(cat .dfx/webserver-port)
+  assert_command dfx config networks.tungsten.providers '[ "http://127.0.0.1:'$webserver_port'" ]'
   dfx canister --network tungsten create --all
   assert_command dfx build --network tungsten
   assert_command ls .dfx/tungsten/canisters/e2e_project/
diff --git a/e2e/bats/create.bash b/e2e/bats/create.bash
index 00c289ec78..b7004bce75 100644
--- a/e2e/bats/create.bash
+++ b/e2e/bats/create.bash
@@ -52,7 +52,8 @@ teardown() {
 @test "create succeeds when requested network is configured" {
     dfx_start
 
-    assert_command dfx config networks.tungsten.providers '[ "http://127.0.0.1:8000" ]'
+    webserver_port=$(cat .dfx/webserver-port)
+    assert_command dfx config networks.tungsten.providers '[ "http://127.0.0.1:'$webserver_port'" ]'
     assert_command dfx canister --network tungsten create --all
 }
 
diff --git a/e2e/bats/default.nix b/e2e/bats/default.nix
index f4f0e92b73..b468eebae4 100644
--- a/e2e/bats/default.nix
+++ b/e2e/bats/default.nix
@@ -4,47 +4,60 @@
 , use_ic_ref ? false
 }:
 let
-  e2e = lib.noNixFiles (lib.gitOnlySource ./.);
-  lib = pkgs.lib;
-  sources = pkgs.sources;
+  inherit (pkgs) lib;
 
-  inputs = with pkgs; [
-    bats
-    bash
-    coreutils
-    diffutils
-    curl
-    findutils
-    gnugrep
-    gnutar
-    gzip
-    jq
-    netcat
-    ps
-    python3
-    procps
-    which
-    dfx.standalone
-  ] ++ lib.optional use_ic_ref ic-ref;
-in
+  isBatsTest = fileName: type: lib.hasSuffix ".bash" fileName && type == "regular";
 
-builtins.derivation {
-  name = "e2e-tests";
-  system = pkgs.stdenv.system;
-  PATH = pkgs.lib.makeSearchPath "bin" inputs;
-  BATSLIB = sources.bats-support;
-  builder =
-    pkgs.writeScript "builder.sh" ''
-      #!${pkgs.stdenv.shell}
-      set -eo pipefail
+  here = ./.;
 
-      # We want $HOME/.cache to be in a new temporary directory.
-      export HOME=$(mktemp -d -t dfx-e2e-home-XXXX)
+  mkBatsTest = fileName:
+    let
+      name = lib.removeSuffix ".bash" fileName;
+    in
+      lib.nameValuePair name (
+        pkgs.runCommandNoCC "e2e-test-${name}${lib.optionalString use_ic_ref "-use_ic_ref"}" {
+          nativeBuildInputs = with pkgs; [
+            bats
+            diffutils
+            curl
+            findutils
+            gnugrep
+            gnutar
+            gzip
+            jq
+            netcat
+            ps
+            python3
+            procps
+            which
+            dfx.standalone
+          ] ++ lib.optional use_ic_ref ic-ref;
+          BATSLIB = pkgs.sources.bats-support;
+          USE_IC_REF = use_ic_ref;
+          utils = lib.gitOnlySource ../../. ./utils;
+          assets = lib.gitOnlySource ../../. ./assets;
+          test = here + "/${fileName}";
+        } ''
+          export HOME=$(pwd)
 
-      export USE_IC_REF=${if use_ic_ref then "1" else ""}
+          ln -s $utils utils
+          ln -s $assets assets
+          ln -s $test test
 
-      # Timeout of 10 minutes is enough for now. Reminder; CI might be running with
-      # less resources than a dev's computer, so e2e might take longer.
-      timeout --preserve-status 3600 bats --recursive ${e2e}/* | tee $out
-    '';
-} // { meta = {}; }
+          # Timeout of 10 minutes is enough for now. Reminder; CI might be running with
+          # less resources than a dev's computer, so e2e might take longer.
+          timeout --preserve-status 3600 bats test | tee $out
+        ''
+      );
+in
+builtins.listToAttrs
+  (
+    builtins.map mkBatsTest
+      (
+        lib.attrNames
+          (
+            lib.filterAttrs isBatsTest
+              (builtins.readDir here)
+          )
+      )
+  )
diff --git a/e2e/bats/frontend.bash b/e2e/bats/frontend.bash
index c242347596..31cda2626a 100644
--- a/e2e/bats/frontend.bash
+++ b/e2e/bats/frontend.bash
@@ -19,7 +19,8 @@ teardown() {
     dfx build --skip-frontend
 
     sleep 1
-    assert_command curl http://localhost:8000 # 8000 = default port.
+    PORT=$(cat .dfx/webserver-port)
+    assert_command curl http://localhost:"$PORT"
     assert_match "<html>"
 }
 
@@ -33,7 +34,7 @@ teardown() {
     dfx canister create --all
     dfx build --skip-frontend
 
-    assert_command curl http://localhost:12345 # 8000 = default port.
+    assert_command curl http://localhost:12345
     assert_match "<html>"
 
     assert_command_fail curl http://localhost:8000
diff --git a/e2e/bats/network.bash b/e2e/bats/network.bash
index 9a3abe0f6e..eec57d13cc 100644
--- a/e2e/bats/network.bash
+++ b/e2e/bats/network.bash
@@ -17,7 +17,8 @@ teardown() {
 @test "create stores canister ids for default-persistent networks in canister_ids.json" {
     dfx_start
 
-    assert_command dfx config networks.tungsten.providers '[ "http://127.0.0.1:8000" ]'
+    webserver_port=$(cat .dfx/webserver-port)
+    assert_command dfx config networks.tungsten.providers '[ "http://127.0.0.1:'$webserver_port'" ]'
 
     assert_command dfx canister --network tungsten create --all
 
@@ -29,7 +30,8 @@ teardown() {
 @test "create stores canister ids for configured-ephemeral networks in canister_ids.json" {
     dfx_start
 
-    assert_command dfx config networks.tungsten.providers '[ "http://127.0.0.1:8000" ]'
+    webserver_port=$(cat .dfx/webserver-port)
+    assert_command dfx config networks.tungsten.providers '[ "http://127.0.0.1:'$webserver_port'" ]'
     cat <<<$(jq .networks.tungsten.type=\"ephemeral\" dfx.json) >dfx.json
 
     assert_command dfx canister --network tungsten create --all
@@ -71,7 +73,8 @@ teardown() {
 @test "failure message does include network if for non-local network" {
     dfx_start
 
-    assert_command dfx config networks.tungsten.providers '[ "http://127.0.0.1:8000" ]'
+    webserver_port=$(cat .dfx/webserver-port)
+    assert_command dfx config networks.tungsten.providers '[ "http://127.0.0.1:'$webserver_port'" ]'
 
     assert_command_fail dfx build --network tungsten
     assert_match "Cannot find canister id. Please issue 'dfx canister --network tungsten create e2e_project"
diff --git a/e2e/bats/ping.bash b/e2e/bats/ping.bash
index 62af13b3f5..44d6cb0530 100644
--- a/e2e/bats/ping.bash
+++ b/e2e/bats/ping.bash
@@ -17,9 +17,6 @@ teardown() {
     assert_command_fail dfx ping
 }
 
-@test "dfx start succeeds" {
-    dfx_start
-}
 
 @test "dfx ping succeeds if replica is running" {
     dfx_start
@@ -30,7 +27,8 @@ teardown() {
 
 @test "dfx ping succeeds by specific host:post" {
     dfx_start
-    assert_command dfx ping http://127.0.0.1:8000
+    webserver_port=$(cat .dfx/webserver-port)
+    assert_command dfx ping http://127.0.0.1:"$webserver_port"
 
     assert_match "\"ic_api_version\""
 }
@@ -44,7 +42,8 @@ teardown() {
 
 @test "dfx ping succeeds by network name if network bind address is host:port format" {
     dfx_start
-    assert_command dfx config networks.local.bind '"127.0.0.1:8000"'
+    webserver_port=$(cat .dfx/webserver-port)
+    assert_command dfx config networks.local.bind '"127.0.0.1:'$webserver_port'"'
     assert_command dfx ping local
 
     assert_match "\"ic_api_version\""
diff --git a/e2e/bats/utils/_.bash b/e2e/bats/utils/_.bash
index 003e9c3cd1..833b3a5fe3 100644
--- a/e2e/bats/utils/_.bash
+++ b/e2e/bats/utils/_.bash
@@ -43,21 +43,31 @@ dfx_start() {
 
         cat <<<$(jq .networks.local.bind=\"127.0.0.1:${port}\" dfx.json) >dfx.json
         cat dfx.json
-        dfx bootstrap --port 8000 &
+        dfx bootstrap --port 0 & # Start on random port for parallel test execution
+        local webserver_port=$(cat .dfx/webserver-port)
         echo $! > dfx-bootstrap.pid
     else
         # Bats creates a FD 3 for test output, but child processes inherit it and Bats will
         # wait for it to close. Because `dfx start` leaves child processes running, we need
         # to close this pipe, otherwise Bats will wait indefinitely.
-        dfx start --background "$@" 3>&-
+        if [[ "$@" == "" ]]; then
+            dfx start --background --host "127.0.0.1:0" 3>&- # Start on random port for parallel test execution
+        else
+            dfx start --background "$@" 3>&- # Start on random port for parallel test execution
+        fi
         local project_dir=${pwd}
         local dfx_config_root=.dfx/client-configuration
         printf "Configuration Root for DFX: %s\n" "${dfx_config_root}"
         test -f ${dfx_config_root}/client-1.port
         local port=$(cat ${dfx_config_root}/client-1.port)
+
+        # Overwrite the default networks.local.bind 127.0.0.1:8000 with allocated port
+        local webserver_port=$(cat .dfx/webserver-port)
+        cat <<<$(jq .networks.local.bind=\"127.0.0.1:${webserver_port}\" dfx.json) >dfx.json
     fi
 
     printf "Replica Configured Port: %s\n" "${port}"
+    printf "Webserver Configured Port: %s\n" "${webserver_port}"
 
     timeout 5 sh -c \
         "until nc -z localhost ${port}; do echo waiting for replica; sleep 1; done" \
diff --git a/src/dfx/Cargo.toml b/src/dfx/Cargo.toml
index b177d145ac..6461fb7b7e 100644
--- a/src/dfx/Cargo.toml
+++ b/src/dfx/Cargo.toml
@@ -39,6 +39,7 @@ lazy_static = "1.4.0"
 libflate = "0.1.27"
 hotwatch = "0.4.3"
 mockall = "0.6.0"
+net2 = "0.2.34"
 petgraph = "0.5.0"
 rand = "0.7.2"
 regex = "1.3.1"
diff --git a/src/dfx/src/commands/bootstrap.rs b/src/dfx/src/commands/bootstrap.rs
index e5edff1c23..3c969a4735 100644
--- a/src/dfx/src/commands/bootstrap.rs
+++ b/src/dfx/src/commands/bootstrap.rs
@@ -5,12 +5,13 @@ use crate::lib::message::UserMessage;
 use crate::lib::network::network_descriptor::NetworkDescriptor;
 use crate::lib::provider::get_network_descriptor;
 use crate::lib::webserver::webserver;
+use crate::util::get_reusable_socket_addr;
 use clap::{App, Arg, ArgMatches, SubCommand};
 use slog::info;
 use std::default::Default;
 use std::fs;
 use std::io::{Error, ErrorKind};
-use std::net::{IpAddr, Ipv4Addr, SocketAddr};
+use std::net::{IpAddr, Ipv4Addr};
 use std::path::PathBuf;
 use std::str::FromStr;
 use std::time::Duration;
@@ -70,11 +71,21 @@ pub fn exec(env: &dyn Environment, args: &ArgMatches<'_>) -> DfxResult {
 
     let (sender, receiver) = crossbeam::unbounded();
 
+    // Since the user may have provided port "0", we need to grab a dynamically
+    // allocated port and construct a resuable SocketAddr which the actix
+    // HttpServer will bind to
+    let socket_addr =
+        get_reusable_socket_addr(config_bootstrap.ip.unwrap(), config_bootstrap.port.unwrap())?;
+
+    let webserver_port_path = env.get_temp_dir().join("webserver-port");
+    std::fs::write(&webserver_port_path, "")?;
+    std::fs::write(&webserver_port_path, socket_addr.port().to_string())?;
+
     webserver(
         logger.clone(),
         build_output_root,
         network_descriptor,
-        SocketAddr::new(config_bootstrap.ip.unwrap(), config_bootstrap.port.unwrap()),
+        socket_addr,
         providers
             .iter()
             .map(|uri| Url::from_str(uri).unwrap())
diff --git a/src/dfx/src/commands/start.rs b/src/dfx/src/commands/start.rs
index 628df41770..a38353ac50 100644
--- a/src/dfx/src/commands/start.rs
+++ b/src/dfx/src/commands/start.rs
@@ -7,6 +7,7 @@ use crate::lib::proxy::{CoordinateProxy, ProxyConfig};
 use crate::lib::proxy_process::spawn_and_update_proxy;
 use crate::lib::replica_config::ReplicaConfig;
 use crate::lib::waiter::create_waiter;
+use crate::util::get_reusable_socket_addr;
 
 use clap::{App, Arg, ArgMatches, SubCommand};
 use crossbeam::channel::{Receiver, Sender};
@@ -20,9 +21,9 @@ use std::net::SocketAddr;
 use std::path::PathBuf;
 use std::process::Command;
 use std::time::Duration;
+
 use sysinfo::{Pid, Process, ProcessExt, Signal, System, SystemExt};
 use tokio::runtime::Runtime;
-
 /// Provide necessary arguments to start the Internet Computer
 /// locally. See `exec` for further information.
 pub fn construct() -> App<'static, 'static> {
@@ -71,12 +72,16 @@ pub fn exec(env: &dyn Environment, args: &ArgMatches<'_>) -> DfxResult {
         .get_config()
         .ok_or(DfxError::CommandMustBeRunInAProject)?;
 
+    let temp_dir = env.get_temp_dir();
+
     let (frontend_url, address_and_port) = frontend_address(args, &config)?;
+    let webserver_port_path = temp_dir.join("webserver-port");
+    std::fs::write(&webserver_port_path, "")?;
+    std::fs::write(&webserver_port_path, address_and_port.port().to_string())?;
 
     let client_pathbuf = env.get_cache().get_binary_command_path("replica")?;
     let ic_starter_pathbuf = env.get_cache().get_binary_command_path("ic-starter")?;
 
-    let temp_dir = env.get_temp_dir();
     let state_root = env.get_state_dir();
 
     let pid_file_path = temp_dir.join("pid");
@@ -113,7 +118,7 @@ pub fn exec(env: &dyn Environment, args: &ArgMatches<'_>) -> DfxResult {
 
     if args.is_present("background") {
         send_background()?;
-        return ping_and_wait(&frontend_url);
+        return Ok(());
     }
 
     // Start the client.
@@ -280,7 +285,7 @@ fn send_background() -> DfxResult<()> {
 }
 
 fn frontend_address(args: &ArgMatches<'_>, config: &Config) -> DfxResult<(String, SocketAddr)> {
-    let address_and_port = args
+    let mut address_and_port = args
         .value_of("host")
         .and_then(|host| Option::from(host.parse()))
         .unwrap_or_else(|| {
@@ -290,12 +295,21 @@ fn frontend_address(args: &ArgMatches<'_>, config: &Config) -> DfxResult<(String
                 .expect("could not get socket_addr"))
         })
         .map_err(|e| DfxError::InvalidArgument(format!("Invalid host: {}", e)))?;
-    let frontend_url = format!(
-        "http://{}:{}",
-        address_and_port.ip(),
-        address_and_port.port()
-    );
 
+    if !args.is_present("background") {
+        // Since the user may have provided port "0", we need to grab a dynamically
+        // allocated port and construct a resuable SocketAddr which the actix
+        // HttpServer will bind to
+        address_and_port =
+            get_reusable_socket_addr(address_and_port.ip(), address_and_port.port())?;
+    }
+    let ip = if address_and_port.is_ipv6() {
+        format!("[{}]", address_and_port.ip())
+    } else {
+        address_and_port.ip().to_string()
+    };
+    let frontend_url = format!("http://{}:{}", ip, address_and_port.port());
+    println!("frontend_url {:?}", frontend_url);
     Ok((frontend_url, address_and_port))
 }
 
diff --git a/src/dfx/src/util/mod.rs b/src/dfx/src/util/mod.rs
index c55918f2e2..ea891022ef 100644
--- a/src/dfx/src/util/mod.rs
+++ b/src/dfx/src/util/mod.rs
@@ -3,10 +3,30 @@ use candid::parser::typing::{check_prog, TypeEnv};
 use candid::types::{Function, Type};
 use candid::{parser::value::IDLValue, IDLArgs, IDLProg};
 use ic_agent::Blob;
+use net2::{unix::UnixTcpBuilderExt, TcpBuilder};
+use std::net::{IpAddr, SocketAddr};
 
 pub mod assets;
 pub mod clap;
 
+// The user can pass in port "0" to dfx start or dfx bootstrap i.e. "127.0.0.1:0" or "[::1]:0",
+// thus, we need to recreate SocketAddr with the kernel provided dynmically allocated port here.
+// TcpBuilder is used with reuse_address and reuse_port set to "true" because
+// the Actix HttpServer in webserver.rs will bind to this SocketAddr.
+pub fn get_reusable_socket_addr(ip: IpAddr, port: u16) -> DfxResult<SocketAddr> {
+    let tcp_builder = if ip.is_ipv4() {
+        TcpBuilder::new_v4()?
+    } else {
+        TcpBuilder::new_v6()?
+    };
+    Ok(tcp_builder
+        .bind(SocketAddr::new(ip, port))?
+        .reuse_address(true)?
+        .reuse_port(true)?
+        .to_tcp_listener()?
+        .local_addr()?)
+}
+
 /// Deserialize and print return values from canister method.
 pub fn print_idl_blob(
     blob: &Blob,