diff --git a/components/compat/compatcomponent.cpp b/components/compat/compatcomponent.cpp
index 7d00e3888..a461818b6 100644
--- a/components/compat/compatcomponent.cpp
+++ b/components/compat/compatcomponent.cpp
@@ -296,6 +296,9 @@ void CompatComponent::DumpServiceStatus(ofstream& fp, const Service::Ptr& servic
 	   << "\t" << "last_update=" << time(NULL) << "\n"
 	   << "\t" << "active_checks_enabled=" << (service->GetEnableChecks() ? 1 : 0) <<"\n"
 	   << "\t" << "passive_checks_enabled=1" << "\n"
+	   << "\t" << "problem_has_been_acknowledged=" << (service->GetAcknowledgement() != AcknowledgementNone ? 1 : 0) << "\n"
+	   << "\t" << "acknowledgement_type=" << static_cast<int>(service->GetAcknowledgement()) << "\n"
+	   << "\t" << "acknowledgement_end_time=" << service->GetAcknowledgementExpiry() << "\n"
 	   << "\t" << "}" << "\n"
 	   << "\n";
 }
diff --git a/lib/icinga/externalcommand.cpp b/lib/icinga/externalcommand.cpp
index 8c4764d34..d7f7496fc 100644
--- a/lib/icinga/externalcommand.cpp
+++ b/lib/icinga/externalcommand.cpp
@@ -38,6 +38,10 @@ void ExternalCommand::Execute(double time, const String& command, const vector<S
 		RegisterCommand("SCHEDULE_HOST_SVC_CHECKS", &ExternalCommand::ScheduleHostSvcChecks);
 		RegisterCommand("ENABLE_HOST_SVC_CHECKS", &ExternalCommand::EnableHostSvcChecks);
 		RegisterCommand("DISABLE_HOST_SVC_CHECKS", &ExternalCommand::DisableHostSvcChecks);
+		RegisterCommand("ACKNOWLEDGE_SVC_PROBLEM", &ExternalCommand::AcknowledgeSvcProblem);
+		RegisterCommand("ACKNOWLEDGE_SVC_PROBLEM_EXPIRE", &ExternalCommand::AcknowledgeSvcProblemExpire);
+		RegisterCommand("REMOVE_SVC_ACKNOWLEDGEMENT", &ExternalCommand::RemoveSvcAcknowledgement);
+
 
 		m_Initialized = true;
 	}
@@ -255,3 +259,50 @@ void ExternalCommand::DisableHostSvcChecks(double time, const vector<String>& ar
 	}
 }
 
+void ExternalCommand::AcknowledgeSvcProblem(double time, const vector<String>& arguments)
+{
+	if (arguments.size() < 7)
+		throw_exception(invalid_argument("Expected 7 arguments."));
+
+	if (!Service::Exists(arguments[1]))
+		throw_exception(invalid_argument("The service '" + arguments[1] + "' does not exist."));
+
+	int sticky = arguments[2].ToDouble();
+
+	Service::Ptr service = Service::GetByName(arguments[1]);
+
+	service->SetAcknowledgement(sticky ? AcknowledgementSticky : AcknowledgementNormal);
+	service->SetAcknowledgementExpiry(0);
+}
+
+void ExternalCommand::AcknowledgeSvcProblemExpire(double time, const vector<String>& arguments)
+{
+	if (arguments.size() < 8)
+		throw_exception(invalid_argument("Expected 8 arguments."));
+
+	if (!Service::Exists(arguments[1]))
+		throw_exception(invalid_argument("The service '" + arguments[1] + "' does not exist."));
+
+	int sticky = arguments[2].ToDouble();
+	double timestamp = arguments[4].ToDouble();
+
+	Service::Ptr service = Service::GetByName(arguments[1]);
+
+	service->SetAcknowledgement(sticky ? AcknowledgementSticky : AcknowledgementNormal);
+	service->SetAcknowledgementExpiry(timestamp);
+}
+
+void ExternalCommand::RemoveSvcAcknowledgement(double time, const vector<String>& arguments)
+{
+	if (arguments.size() < 2)
+		throw_exception(invalid_argument("Expected 2 arguments."));
+
+	if (!Service::Exists(arguments[1]))
+		throw_exception(invalid_argument("The service '" + arguments[1] + "' does not exist."));
+
+	Service::Ptr service = Service::GetByName(arguments[1]);
+
+	service->SetAcknowledgement(AcknowledgementNone);
+	service->SetAcknowledgementExpiry(0);
+}
+
diff --git a/lib/icinga/externalcommand.h b/lib/icinga/externalcommand.h
index adb7eb555..346c6041b 100644
--- a/lib/icinga/externalcommand.h
+++ b/lib/icinga/externalcommand.h
@@ -39,6 +39,9 @@ public:
 	static void ScheduleHostSvcChecks(double time, const vector<String>& arguments);
 	static void EnableHostSvcChecks(double time, const vector<String>& arguments);
 	static void DisableHostSvcChecks(double time, const vector<String>& arguments);
+	static void AcknowledgeSvcProblem(double time, const vector<String>& arguments);
+	static void AcknowledgeSvcProblemExpire(double time, const vector<String>& arguments);
+	static void RemoveSvcAcknowledgement(double time, const vector<String>& arguments);
 
 private:
 	typedef function<void (double time, const vector<String>& arguments)> Callback;
diff --git a/lib/icinga/service.cpp b/lib/icinga/service.cpp
index ef9b94dbd..d9d49ec5c 100644
--- a/lib/icinga/service.cpp
+++ b/lib/icinga/service.cpp
@@ -43,7 +43,9 @@ static AttributeDescription serviceAttributes[] = {
 	{ "last_state_change", Attribute_Replicated },
 	{ "last_hard_state_change", Attribute_Replicated },
 	{ "enable_checks", Attribute_Replicated },
-	{ "force_next_check", Attribute_Replicated }
+	{ "force_next_check", Attribute_Replicated },
+	{ "acknowledgement", Attribute_Replicated },
+	{ "acknowledgement_expiry", Attribute_Replicated }
 };
 
 REGISTER_TYPE(Service, serviceAttributes);
@@ -385,6 +387,48 @@ void Service::SetForceNextCheck(bool forced)
 	Set("force_next_check", forced ? 1 : 0);
 }
 
+AcknowledgementType Service::GetAcknowledgement(void)
+{
+	Value value = Get("acknowledgement");
+
+	if (value.IsEmpty())
+		return AcknowledgementNone;
+
+	int ivalue = static_cast<int>(value);
+	AcknowledgementType avalue = static_cast<AcknowledgementType>(ivalue);
+
+	if (avalue != AcknowledgementNone) {
+		double expiry = GetAcknowledgementExpiry();
+
+		if (expiry != 0 && expiry < Utility::GetTime()) {
+			avalue = AcknowledgementNone;
+			SetAcknowledgementExpiry(avalue);
+		}
+	}
+
+	return avalue;
+}
+
+void Service::SetAcknowledgement(AcknowledgementType acknowledgement)
+{
+	Set("acknowledgement", static_cast<long>(acknowledgement));
+}
+
+double Service::GetAcknowledgementExpiry(void) const
+{
+	Value value = Get("acknowledgement_expiry");
+
+	if (value.IsEmpty())
+		return 0;
+
+	return static_cast<double>(value);
+}
+
+void Service::SetAcknowledgementExpiry(double timestamp)
+{
+	Set("acknowledgement_expiry", timestamp);
+}
+
 void Service::ApplyCheckResult(const Dictionary::Ptr& cr)
 {
 	ServiceState old_state = GetState();
@@ -421,6 +465,13 @@ void Service::ApplyCheckResult(const Dictionary::Ptr& cr)
 
 		if (old_stateType != GetStateType())
 			SetLastHardStateChange(now);
+
+		/* remove acknowledgements */
+		if (GetAcknowledgement() == AcknowledgementNormal ||
+		    (GetAcknowledgement() == AcknowledgementSticky && GetStateType() == StateTypeHard && GetState() == StateOK)) {
+			SetAcknowledgement(AcknowledgementNone);
+			SetAcknowledgementExpiry(0);
+		}
 	}
 }
 
diff --git a/lib/icinga/service.h b/lib/icinga/service.h
index 99b143950..91bbc92b0 100644
--- a/lib/icinga/service.h
+++ b/lib/icinga/service.h
@@ -48,6 +48,18 @@ enum ServiceStateType
 	StateTypeHard
 };
 
+/**
+ * The acknowledgement type of a service.
+ *
+ * @ingroup icinga
+ */
+enum AcknowledgementType
+{
+	AcknowledgementNone = 0,
+	AcknowledgementNormal = 1,
+	AcknowledgementSticky = 2
+};
+
 class CheckResultMessage;
 class ServiceStatusMessage;
 
@@ -122,6 +134,12 @@ public:
 	bool GetForceNextCheck(void) const;
 	void SetForceNextCheck(bool forced);
 
+	AcknowledgementType GetAcknowledgement(void);
+	void SetAcknowledgement(AcknowledgementType acknowledgement);
+
+	double GetAcknowledgementExpiry(void) const;
+	void SetAcknowledgementExpiry(double timestamp);
+
 	void ApplyCheckResult(const Dictionary::Ptr& cr);
 
 	void BeginExecuteCheck(const function<void (void)>& callback);