diff --git a/app/models/scheduler.rb b/app/models/scheduler.rb
index a59b986c6..b7c05350c 100644
--- a/app/models/scheduler.rb
+++ b/app/models/scheduler.rb
@@ -57,6 +57,7 @@ class Scheduler < ApplicationModel
       job.pid = ''
       job.save
       logger.info " ...stopped thread for '#{job.method}'"
+      ActiveRecord::Base.connection.close
     }
   end
 
diff --git a/lib/import/otrs2.rb b/lib/import/otrs2.rb
index f653ed7de..f88497f8f 100644
--- a/lib/import/otrs2.rb
+++ b/lib/import/otrs2.rb
@@ -377,6 +377,7 @@ module Import::OTRS2
           end
           _ticket_result(records, locks)
         end
+        ActiveRecord::Base.connection.close
       }
     }
     (1..thread_count).each {|thread|
diff --git a/lib/sessions.rb b/lib/sessions.rb
index 0962312d9..64bc64c37 100644
--- a/lib/sessions.rb
+++ b/lib/sessions.rb
@@ -498,6 +498,7 @@ returns
             thread_client(client_id)
             @@client_threads[client_id] = nil
             puts "close client (#{client_id}) thread"
+            ActiveRecord::Base.connection.close
           }
           sleep 0.5
         end