diff --git a/management/auth.py b/management/auth.py
index ca25cf54..c576d01c 100644
--- a/management/auth.py
+++ b/management/auth.py
@@ -1,4 +1,7 @@
 import base64, os, os.path, hmac, json, secrets
+from datetime import timedelta
+
+from expiringdict import ExpiringDict
 
 import utils
 from mailconfig import get_mail_password, get_mail_user_privileges
@@ -8,12 +11,13 @@ DEFAULT_KEY_PATH   = '/var/lib/mailinabox/api.key'
 DEFAULT_AUTH_REALM = 'Mail-in-a-Box Management Server'
 
 class AuthService:
-	def __init__(self, session):
+	def __init__(self):
 		self.auth_realm = DEFAULT_AUTH_REALM
 		self.key_path = DEFAULT_KEY_PATH
+		self.max_session_duration = timedelta(days=2)
 
 		self.init_system_api_key()
-		self.sessions = session
+		self.sessions = ExpiringDict(max_len=64, max_age_seconds=self.max_session_duration.total_seconds())
 
 	def init_system_api_key(self):
 		"""Write an API key to a local file so local processes can use the API"""
diff --git a/management/daemon.py b/management/daemon.py
index 5773f4ed..98c6689c 100755
--- a/management/daemon.py
+++ b/management/daemon.py
@@ -15,19 +15,18 @@ import multiprocessing.pool, subprocess
 
 from functools import wraps
 
-from flask import Flask, request, render_template, abort, Response, send_from_directory, make_response, session
+from flask import Flask, request, render_template, abort, Response, send_from_directory, make_response
 
 import auth, utils
 from mailconfig import get_mail_users, get_mail_users_ex, get_admins, add_mail_user, set_mail_password, remove_mail_user
 from mailconfig import get_mail_user_privileges, add_remove_mail_user_privilege
 from mailconfig import get_mail_aliases, get_mail_aliases_ex, get_mail_domains, add_mail_alias, remove_mail_alias
 from mfa import get_public_mfa_state, provision_totp, validate_totp_secret, enable_mfa, disable_mfa
-from datetime import timedelta
-
-DEFAULT_SESSION_SECRET_PATH = '/var/lib/mailinabox/session.key'
 
 env = utils.load_environment()
 
+auth_service = auth.AuthService()
+
 # We may deploy via a symbolic link, which confuses flask's template finding.
 me = __file__
 try:
@@ -45,16 +44,6 @@ with open(os.path.join(os.path.dirname(me), "csr_country_codes.tsv")) as f:
 
 app = Flask(__name__, template_folder=os.path.abspath(os.path.join(os.path.dirname(me), "templates")))
 
-# sets up Flask session to be permanent and lasting 2 days.
-with open(DEFAULT_SESSION_SECRET_PATH, 'r') as file:
-	app.secret_key = file.read()
-app.config['SESSION_PERMANENT'] = True
-app.config['SESSION_TYPE'] = 'filesystem'
-app.config['PERMANENT_SESSION_LIFETIME']=timedelta(days=2)
-
-# AuthService uses the Flask session
-auth_service = auth.AuthService(session)
-
 # Decorator to protect views that require a user with 'admin' privileges.
 def authorized_personnel_only(viewfunc):
 	@wraps(viewfunc)
@@ -173,7 +162,7 @@ def login():
 		"privileges": privs,
 		"api_key": auth_service.create_session_key(email, env, type='login'),
 	}
-	session.permanent = True
+
 	app.logger.info("New login session created for {}".format(email))
 
 	# Return.
diff --git a/setup/management.sh b/setup/management.sh
index 90f93eda..cebed8d5 100755
--- a/setup/management.sh
+++ b/setup/management.sh
@@ -101,12 +101,11 @@ export LC_TYPE=en_US.UTF-8
 
 mkdir -p /var/lib/mailinabox
 tr -cd '[:xdigit:]' < /dev/urandom | head -c 32 > /var/lib/mailinabox/api.key
-tr -cd '[:alnum:]'  < /dev/urandom | head -c 64 > /var/lib/mailinabox/session.key
-chmod 640 /var/lib/mailinabox/{api,session}.key
+chmod 640 /var/lib/mailinabox/api.key
 
 source $venv/bin/activate
 export PYTHONPATH=$(pwd)/management
-exec gunicorn -b localhost:10222 -w 2 wsgi:app
+exec gunicorn -b localhost:10222 -w 1 wsgi:app
 EOF
 chmod +x $inst_dir/start
 cp --remove-destination conf/mailinabox.service /lib/systemd/system/mailinabox.service # target was previously a symlink so remove it first