diff --git a/app/models/concerns/external_user.rb b/app/models/concerns/external_user.rb
index cdbc929..a00a7d0 100644
--- a/app/models/concerns/external_user.rb
+++ b/app/models/concerns/external_user.rb
@@ -1,5 +1,4 @@
 require 'ostruct'
-require 'rails/commands/server'
 
 module ExternalUser
   extend ActiveSupport::Concern
@@ -19,8 +18,8 @@ module ExternalUser
   module ClassMethods
     def webfinger_lookup(login, domain, environment)
       if login && domain && environment.has_federated_network?(domain)
-        rails = Rails::Server.new
-        url = URI.parse('https://'+rails.options[:Host]+':'+rails.options[:Port].to_s+'/.well-known/webfinger?resource=acct:'+login+'@'+domain)
+        url = URI.parse('https://'+ domain +'/.well-known/webfinger?resource=acct:'+
+                         login+'@'+Environment.default.federated_networks.find_by_url(domain))
         req = Net::HTTP::Get.new(url.to_s)
         res = Net::HTTP.start(url.host, url.port) { |http| http.request(req) }
         JSON.parse(res.body)
--
libgit2 0.21.2