diff --git a/.devcontainer/docker-compose.yml b/.devcontainer/docker-compose.yml
index fc156f6..0fc0bd9 100644
--- a/.devcontainer/docker-compose.yml
+++ b/.devcontainer/docker-compose.yml
@@ -17,6 +17,7 @@ services:
       VAULT_CREATE_ROOT: true
       VAULT_ROOT_CA_MOUNT: pki
       VAULT_ROOT_CA_REF: root-ca
+      VAULT_SSL_CERT: cert/vault.pem
       JWT_SIGNING_KEY: jwt_secret
       APP_REGISTRY_ADDR: http://app_registry:8800
       APP_REGISTRY_TOKEN: app_reg_token
@@ -26,9 +27,26 @@ services:
     restart: unless-stopped
     ports:
       - 8200:8200
+      - 8443:8443
+    volumes:
+      - ../cert:/vault/cert
     environment:
       VAULT_DEV_ROOT_TOKEN_ID: root_token
-      VAULT_DEV_LISTEN_ADDRESS: 0.0.0.0:8200
+      VAULT_LOCAL_CONFIG: >
+        {
+            "listener": [
+                {
+                    "tcp": {
+                        "address": "0.0.0.0:8443",
+                        "tls_disable": "0",
+                        "tls_cert_file": "/vault/cert/vault.pem",
+                        "tls_key_file": "/vault/cert/vault.key"
+                    }
+                }
+            ],
+            "default_lease_ttl": "168h",
+            "max_lease_ttl": "720h"
+        }
 
   oidc_provider:
     image: hashicorp/vault:latest
diff --git a/Gemfile.lock b/Gemfile.lock
index 3faf813..ac74dd8 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,29 +1,29 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    actioncable (7.2.1)
-      actionpack (= 7.2.1)
-      activesupport (= 7.2.1)
+    actioncable (7.2.1.1)
+      actionpack (= 7.2.1.1)
+      activesupport (= 7.2.1.1)
       nio4r (~> 2.0)
       websocket-driver (>= 0.6.1)
       zeitwerk (~> 2.6)
-    actionmailbox (7.2.1)
-      actionpack (= 7.2.1)
-      activejob (= 7.2.1)
-      activerecord (= 7.2.1)
-      activestorage (= 7.2.1)
-      activesupport (= 7.2.1)
+    actionmailbox (7.2.1.1)
+      actionpack (= 7.2.1.1)
+      activejob (= 7.2.1.1)
+      activerecord (= 7.2.1.1)
+      activestorage (= 7.2.1.1)
+      activesupport (= 7.2.1.1)
       mail (>= 2.8.0)
-    actionmailer (7.2.1)
-      actionpack (= 7.2.1)
-      actionview (= 7.2.1)
-      activejob (= 7.2.1)
-      activesupport (= 7.2.1)
+    actionmailer (7.2.1.1)
+      actionpack (= 7.2.1.1)
+      actionview (= 7.2.1.1)
+      activejob (= 7.2.1.1)
+      activesupport (= 7.2.1.1)
       mail (>= 2.8.0)
       rails-dom-testing (~> 2.2)
-    actionpack (7.2.1)
-      actionview (= 7.2.1)
-      activesupport (= 7.2.1)
+    actionpack (7.2.1.1)
+      actionview (= 7.2.1.1)
+      activesupport (= 7.2.1.1)
       nokogiri (>= 1.8.5)
       racc
       rack (>= 2.2.4, < 3.2)
@@ -32,35 +32,35 @@ GEM
       rails-dom-testing (~> 2.2)
       rails-html-sanitizer (~> 1.6)
       useragent (~> 0.16)
-    actiontext (7.2.1)
-      actionpack (= 7.2.1)
-      activerecord (= 7.2.1)
-      activestorage (= 7.2.1)
-      activesupport (= 7.2.1)
+    actiontext (7.2.1.1)
+      actionpack (= 7.2.1.1)
+      activerecord (= 7.2.1.1)
+      activestorage (= 7.2.1.1)
+      activesupport (= 7.2.1.1)
       globalid (>= 0.6.0)
       nokogiri (>= 1.8.5)
-    actionview (7.2.1)
-      activesupport (= 7.2.1)
+    actionview (7.2.1.1)
+      activesupport (= 7.2.1.1)
       builder (~> 3.1)
       erubi (~> 1.11)
       rails-dom-testing (~> 2.2)
       rails-html-sanitizer (~> 1.6)
-    activejob (7.2.1)
-      activesupport (= 7.2.1)
+    activejob (7.2.1.1)
+      activesupport (= 7.2.1.1)
       globalid (>= 0.3.6)
-    activemodel (7.2.1)
-      activesupport (= 7.2.1)
-    activerecord (7.2.1)
-      activemodel (= 7.2.1)
-      activesupport (= 7.2.1)
+    activemodel (7.2.1.1)
+      activesupport (= 7.2.1.1)
+    activerecord (7.2.1.1)
+      activemodel (= 7.2.1.1)
+      activesupport (= 7.2.1.1)
       timeout (>= 0.4.0)
-    activestorage (7.2.1)
-      actionpack (= 7.2.1)
-      activejob (= 7.2.1)
-      activerecord (= 7.2.1)
-      activesupport (= 7.2.1)
+    activestorage (7.2.1.1)
+      actionpack (= 7.2.1.1)
+      activejob (= 7.2.1.1)
+      activerecord (= 7.2.1.1)
+      activesupport (= 7.2.1.1)
       marcel (~> 1.0)
-    activesupport (7.2.1)
+    activesupport (7.2.1.1)
       base64
       bigdecimal
       concurrent-ruby (~> 1.0, >= 1.3.1)
@@ -105,7 +105,7 @@ GEM
       concurrent-ruby (~> 1.0)
     interactor (3.1.2)
     io-console (0.7.2)
-    irb (1.14.0)
+    irb (1.14.1)
       rdoc (>= 4.0.0)
       reline (>= 0.4.2)
     jbuilder (2.13.0)
@@ -130,7 +130,7 @@ GEM
     msgpack (1.7.2)
     net-http (0.4.1)
       uri
-    net-imap (0.4.14)
+    net-imap (0.4.17)
       date
       net-protocol
     net-pop (0.1.2)
@@ -162,7 +162,7 @@ GEM
     puma (6.4.3)
       nio4r (~> 2.0)
     racc (1.8.1)
-    rack (3.1.7)
+    rack (3.1.8)
     rack-session (2.0.0)
       rack (>= 3.0.0)
     rack-test (2.1.0)
@@ -170,20 +170,20 @@ GEM
     rackup (2.1.0)
       rack (>= 3)
       webrick (~> 1.8)
-    rails (7.2.1)
-      actioncable (= 7.2.1)
-      actionmailbox (= 7.2.1)
-      actionmailer (= 7.2.1)
-      actionpack (= 7.2.1)
-      actiontext (= 7.2.1)
-      actionview (= 7.2.1)
-      activejob (= 7.2.1)
-      activemodel (= 7.2.1)
-      activerecord (= 7.2.1)
-      activestorage (= 7.2.1)
-      activesupport (= 7.2.1)
+    rails (7.2.1.1)
+      actioncable (= 7.2.1.1)
+      actionmailbox (= 7.2.1.1)
+      actionmailer (= 7.2.1.1)
+      actionpack (= 7.2.1.1)
+      actiontext (= 7.2.1.1)
+      actionview (= 7.2.1.1)
+      activejob (= 7.2.1.1)
+      activemodel (= 7.2.1.1)
+      activerecord (= 7.2.1.1)
+      activestorage (= 7.2.1.1)
+      activesupport (= 7.2.1.1)
       bundler (>= 1.15.0)
-      railties (= 7.2.1)
+      railties (= 7.2.1.1)
     rails-dom-testing (2.2.0)
       activesupport (>= 5.0.0)
       minitest
@@ -191,9 +191,9 @@ GEM
     rails-html-sanitizer (1.6.0)
       loofah (~> 2.21)
       nokogiri (~> 1.14)
-    railties (7.2.1)
-      actionpack (= 7.2.1)
-      activesupport (= 7.2.1)
+    railties (7.2.1.1)
+      actionpack (= 7.2.1.1)
+      activesupport (= 7.2.1.1)
       irb (~> 1.13)
       rackup (>= 1.0.0)
       rake (>= 12.2)
@@ -204,7 +204,7 @@ GEM
     rdoc (6.7.0)
       psych (>= 4.0.0)
     regexp_parser (2.9.2)
-    reline (0.5.9)
+    reline (0.5.10)
       io-console (~> 0.5)
     rexml (3.3.5)
       strscan
@@ -251,7 +251,7 @@ GEM
     sqlite3 (2.1.0-x86_64-linux-musl)
     stringio (3.1.1)
     strscan (3.1.0)
-    thor (1.3.1)
+    thor (1.3.2)
     timeout (0.4.1)
     tzinfo (2.0.6)
       concurrent-ruby (~> 1.0)
@@ -260,11 +260,11 @@ GEM
     useragent (0.16.10)
     vault (0.18.2)
       aws-sigv4
-    webrick (1.8.1)
+    webrick (1.8.2)
     websocket-driver (0.7.6)
       websocket-extensions (>= 0.1.0)
     websocket-extensions (0.1.5)
-    zeitwerk (2.6.17)
+    zeitwerk (2.7.0)
 
 PLATFORMS
   aarch64-linux
diff --git a/README.md b/README.md
index 51365a3..b732953 100644
--- a/README.md
+++ b/README.md
@@ -62,7 +62,33 @@ docker build -t astral:latest .
 docker run -p 3000:3000 astral:latest
 ```
 
-# OIDC configuration
+# Configuration
+Astral is configured in `config/astral.yml` -- all availble
+configuration options are listed in the `shared` section. Note that
+configuration values can be supplied in this file or as process
+environment variables with the same names (but
+UPPER_CASE). Environment vars will override any values in the config
+file.  Per-environment settings in the config file(development, test,
+production) will override the shared values for that type.
+
+## mTLS connections
+Astral can connect to Vault with mTLS. Just
+set the following values in `config/astral.yml`:
+```
+  vault_ssl_cert:
+  vault_ssl_client_cert:
+  vault_ssl_client_key:
+```
+A self-signed server cert for Vault can be generated with the following 
+command:
+```
+rake configure:ssl
+```
+
+To use SSL in the devcontainer, edit `.devcontainer/docker-compose.yml` so
+that the `app` service has `VAULT_ADDRESS` of `https://vault:8443`. 
+
+## OIDC configuration
 The OIDC modules allow the assignment of a policy to an OIDC user, by
 mapping that user's email address to a policy we create.  They work as
 follows:
@@ -132,3 +158,5 @@ the provider settings, so you will need to clear the browser's
 ```
   * Vault login failed. Expired or missing OAuth state.
 ```
+
+
diff --git a/app/lib/clients/vault.rb b/app/lib/clients/vault.rb
index 811d544..5a68e85 100644
--- a/app/lib/clients/vault.rb
+++ b/app/lib/clients/vault.rb
@@ -15,7 +15,10 @@ class << self
       def client
         ::Vault::Client.new(
           address: address,
-          token: token
+          token: token,
+          ssl_ca_cert: ssl_cert,
+          ssl_pem_file: ssl_client_cert,
+          ssl_key_file: ssl_client_key
         )
       end
 
@@ -23,6 +26,18 @@ def address
         Config[:vault_addr]
       end
 
+      def ssl_cert
+        Config[:vault_ssl_cert]
+      end
+
+      def ssl_client_cert
+        Config[:vault_ssl_client_cert]
+      end
+
+      def ssl_client_key
+        Config[:vault_ssl_client_key]
+      end
+
       def enable_engine(mount, type)
         client.sys.mount(mount, type, "#{type} secrets engine")
       end
diff --git a/cert/.keep b/cert/.keep
new file mode 100644
index 0000000..e69de29
diff --git a/cert/vault.csr b/cert/vault.csr
new file mode 100644
index 0000000..3b882f7
--- /dev/null
+++ b/cert/vault.csr
@@ -0,0 +1,27 @@
+-----BEGIN CERTIFICATE REQUEST-----
+MIIElzCCAn8CAQAwUjELMAkGA1UEBhMCVVMxDzANBgNVBAgMBkRlbmlhbDEUMBIG
+A1UEBwwLU3ByaW5nZmllbGQxDDAKBgNVBAoMA0RpczEOMAwGA1UEAwwFdmF1bHQw
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+JCy4FPyt1+iqfDzjtS74h261lVm6bHnW+7bI
+-----END CERTIFICATE REQUEST-----
diff --git a/cert/vault.key b/cert/vault.key
new file mode 100644
index 0000000..20ddc1b
--- /dev/null
+++ b/cert/vault.key
@@ -0,0 +1,52 @@
+-----BEGIN PRIVATE KEY-----
+MIIJQwIBADANBgkqhkiG9w0BAQEFAASCCS0wggkpAgEAAoICAQC4GT1p/wZyxvMs
+Z/N7g6HbSNqTCA6W+JbPryhy2YjVwdH+JwYQGy4GbXYxbKZp5ZXAf5/9/y6j8Bns
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+tvuarGIc32Of4/2OAIXzPH3IF5mWYYuvGA8vgmk1ZM/lcZ3DYhWuT7UiWQIS5GB+
+NJYMf5xB9G5Wnmq5H9RmkeAozNjnSDZHGQiGLwKW4LVqbkSxGGbGpXS57Si+QvBJ
+7sscXOjF3wtZdFCFacS9FPm9KRjD7AU=
+-----END PRIVATE KEY-----
diff --git a/cert/vault.pem b/cert/vault.pem
new file mode 100644
index 0000000..b7c6371
--- /dev/null
+++ b/cert/vault.pem
@@ -0,0 +1,30 @@
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----
diff --git a/config/astral.yml b/config/astral.yml
index 9686c14..280e374 100644
--- a/config/astral.yml
+++ b/config/astral.yml
@@ -1,24 +1,33 @@
+# Astral configuration
+# Note that values can be supplied here or as environment vars (UPPER_CASE).
 shared:
-  vault_addr: 
   vault_token:
-
-  # Pre-existing root CA, or create new if requested
+  vault_addr:
+  # if VAULT_ADDR is https with self-signed cert, need to provide
+  # CA cert (path to file) in "vault_ssl_cert" below:
+  vault_ssl_cert:
+  # Vault client cert if required (path to file)
+  vault_ssl_client_cert:
+  vault_ssl_client_key:
+
+  # Vault PKI configuration -- create root CA when true, or reference an existing
   vault_create_root: true
   vault_root_ca_ref: root_ca
   vault_root_ca_mount: pki_root
+  cert_ttl:
 
   jwt_signing_key:
-  cert_ttl:
 
+  # When using AppRegistry for Domain Ownership information
   app_registry_addr:
   app_registry_token:
   app_registry_ca_file:
   app_registry_client_cert:
   app_registry_client_key:
 
+  # User activity logging
   audit_log_file: <%= "#{Rails.root.join('log')}/astral-audit.log" %>
 
-  oidc_issuer:
   oidc_client_id:
   oidc_client_secret:
   oidc_redirect_uris: http://localhost:8250/oidc/callback
diff --git a/lib/tasks/configure.rake b/lib/tasks/configure.rake
new file mode 100644
index 0000000..80ad985
--- /dev/null
+++ b/lib/tasks/configure.rake
@@ -0,0 +1,17 @@
+require "rake"
+
+# Rake tasks for making a vault cert
+namespace :configure do
+  desc "Make the server cert for vault"
+  task :ssl do
+    %x(
+      openssl req -new -newkey rsa:4096 -nodes \
+        -keyout cert/vault.key -out cert/vault.csr \
+        -subj "/C=US/ST=Denial/L=Springfield/O=Dis/CN=vault"
+      openssl x509 -req -days 365 -in cert/vault.csr \
+        -signkey cert/vault.key \
+        -out cert/vault.pem
+    )
+    puts "SSL key for vault created"
+  end
+end
diff --git a/lib/tasks/redoc.rake b/lib/tasks/redoc.rake
index 8810fa6..0452fc6 100644
--- a/lib/tasks/redoc.rake
+++ b/lib/tasks/redoc.rake
@@ -6,8 +6,8 @@ namespace :redoc do
   task :bundle do
     %x(
       docker run -v /workspaces/astral/doc/openapi:/data -w /data \
-      redocly/cli bundle openapi.yml \
-      --output openapi-bundled.yml
+        redocly/cli bundle openapi.yml \
+        --output openapi-bundled.yml
     )
     puts "openapi.yml and references bundled to openapi-bundled.yml"
   end
diff --git a/test/lib/clients/vault_test.rb b/test/lib/clients/vault_test.rb
index e18337c..51ca0a8 100644
--- a/test/lib/clients/vault_test.rb
+++ b/test/lib/clients/vault_test.rb
@@ -115,7 +115,10 @@ class VaultTest < ActiveSupport::TestCase
   def vault_client
     ::Vault::Client.new(
           address: vault_addr,
-          token: vault_token
+          token: vault_token,
+          ssl_ca_cert: ssl_cert,
+          ssl_pem_file: ssl_client_cert,
+          ssl_key_file: ssl_client_key
     )
   end
 
@@ -126,4 +129,16 @@ def vault_addr
   def vault_token
     Config[:vault_token]
   end
+
+  def ssl_cert
+    Config[:vault_ssl_cert]
+  end
+
+  def ssl_client_cert
+    Config[:vault_ssl_client_cert]
+  end
+
+  def ssl_client_key
+    Config[:vault_ssl_client_key]
+  end
 end