Sts 2.9.2

I am using STS 2.9.2 for grails project. I get the following error while installing the grails webflow plugin via grails command : install-plugin webflow

please help in providing the step-by-step process to install the plugin. Have used the grails installation manager but was not successful


::: ERRORS
Server access Error: Connection timed out: connect url=http://repo.grails.org/grails/plugins/org/grails/plugins/webflow/latest.integration/webflow-latest.integration.pom

Server access Error: Connection timed out: connect url=http://repo.grails.org/grails/plugins/org/grails/plugins/webflow/maven-metadata.xml

Server access Error: Connection timed out: connect url=http://repo.grails.org/grails/plugins/org/grails/plugins/webflow/latest.integration/webflow-latest.integration.zip

Server access Error: Connection timed out: connect url=http://repo.grails.org/grails/core/org/grails/plugins/webflow/latest.integration/webflow-latest.integration.pom

Server access Error: Connection timed out: connect url=http://repo.grails.org/grails/core/org/grails/plugins/webflow/maven-metadata.xml

Server access Error: Connection timed out: connect url=http://repo.grails.org/grails/core/org/grails/plugins/webflow/latest.integration/webflow-latest.integration.zip

Server access Error: Connection timed out: connect url=http://repo1.maven.org/maven2/org/grails/plugins/webflow/latest.integration/webflow-latest.integration.pom

Server access Error: Connection timed out: connect url=http://repo1.maven.org/maven2/org/grails/plugins/webflow/maven-metadata.xml

Server access Error: Connection timed out: connect url=http://repo1.maven.org/maven2/org/grails/plugins/webflow/latest.integration/webflow-latest.integration.zip

| Error resolving plugin [name:webflow, group:org.grails.plugins, version:latest.integration]. Plugin not found.
| Error Plugin not found for name [webflow] and version [not specified]