diff --git a/docs/system-admin-documentation/advanced-features/openbis-sync.md b/docs/system-admin-documentation/advanced-features/openbis-sync.md
index a9543405cb2737aa6283bc87b9f7e7e998f4fc20..4f94196d4f6223120ccf88b05b6a97654dd878ca 100644
--- a/docs/system-admin-documentation/advanced-features/openbis-sync.md
+++ b/docs/system-admin-documentation/advanced-features/openbis-sync.md
@@ -13,17 +13,9 @@ data from several data-source instances.
 
 ## Data Source
 
-The Data Source instance provides a service based on the ResourceSync
-Framework Specification (see
-<http://www.openarchives.org/rs/1.1/resourcesync>). This service is
-provided as [core plugin](/pages/viewpage.action?pageId=80699503) module
-`openbis-sync` which has a DSS service based on [Service
-Plugins](/pages/viewpage.action?pageId=80699366).
-
-This DSS service access the main openBIS database directly. If the name
-of this database isn't {{openbis\_prod}} the property `database.kind` in
-DSS service.properties should be defined with the same value as the same
-property in AS service.properties. Example:
+The Data Source instance provides a service based on the ResourceSync Framework Specification (see <http://www.openarchives.org/rs/1.1/resourcesync>). This service is provided as [core plugin](https://openbis.readthedocs.io/en/latest/software-developer-documentation/server-side-extensions/core-plugins.html#core-plugins) module `openbis-sync` which has a DSS service based on [Service Plugins](https://unlimited.ethz.ch/display/openBISDoc2010/Service+Plugins).
+
+This DSS service access the main openBIS database directly. If the name of this database isn't {{openbis\_prod}} the property `database.kind` in DSS service.properties should be defined with the same value as the same property in AS service.properties. Example:
 
 **servers/openBIS-server/jetty/etc/plugin.properties**
 
@@ -92,11 +84,7 @@ Remarks:
 
 ## Harvester
 
-In order to get the data and meta-data from a Data Source openBIS
-instance a DSS harvester [maintenance
-task](/pages/viewpage.action?pageId=80699482) has to be configured on
-the Harvester openBIS instance. This maintenance task reads another
-configuration file each time the task is executed.
+In order to get the data and meta-data from a Data Source openBIS instance a DSS harvester [maintenance task](https://openbis.readthedocs.io/en/latest/system-admin-documentation/advanced-features/maintenance-tasks.html#maintenance-tasks) has to be configured on the Harvester openBIS instance. This maintenance task reads another configuration file each time the task is executed.
 
 **plugin.properties**