diff --git a/lib/peter/strategies/institutional.rb b/lib/peter/strategies/institutional.rb
index 6ae7a3f..d234cb2 100644
--- a/lib/peter/strategies/institutional.rb
+++ b/lib/peter/strategies/institutional.rb
@@ -1,40 +1,39 @@
 Warden::Strategies.add(:institutional) do
   def valid?
-    Rails.logger.warn("WARDEN: INFO institutional")
-    fetch_header('HTTP_PERSISTENT_ID').present? &&
+    fetch_header('HTTP_REMOTE_USER').present? &&
       fetch_header('HTTP_MAIL').present? &&
       fetch_header('HTTP_ENTITLEMENT').present? &&
       fetch_header('HTTP_ENTITLEMENT').include?('urn:mace:grnet.gr:archiving:admin')
   end
 
   def fetch_header(header)
     request.env[header]
   end
 
   def authenticate!
     Rails.logger.warn("WARDEN: INFO institutional has valid headers")
     if !Archiving.settings[:institutional_authentication_enabled]
       return fail!("Shibboleth is temporarily disabled")
     end
 
-    identifier = "institutional:#{fetch_header("HTTP_PERSISTENT_ID")}"
+    identifier = "institutional:#{fetch_header("HTTP_REMOTE_USER")}"
     user = User.find_or_initialize_by(identifier: identifier)
 
     return fail!("Wrong credentials") unless user
 
     user.login_at = Time.now
 
     if user.new_record?
       user.email = fetch_header("HTTP_MAIL")
       user.username = fetch_header("HTTP_MAIL")
       user.enabled = true
       user.institutional!
     else
       user.save
     end
 
     return fail!("Service not available") unless user.enabled?
 
     success!(user)
   end
 end