jenkins PR builds unable to connect to nexus: "Connection reset"

jenkins PR build currently fail to contact nexus with a "Connection reset":

• in jbosstools-base: https://dev-platform-jenkins.rhev-ci-vms.eng.rdu2.redhat.com/job/jbosstools-base-Pull-Request/162/console

  [ERROR] The build could not read 1 project -> [Help 1]
  [ERROR]   
  [ERROR]   The project org.jboss.tools:base:4.5.0-SNAPSHOT (/mnt/hudson_workspace/workspace/jbosstools-base-Pull-Request/pom.xml) has 1 error
  [ERROR]     Non-resolvable parent POM org.jboss.tools:parent:4.5.1.Final-SNAPSHOT for org.jboss.tools:base:4.5.0-SNAPSHOT: Could not transfer artifact org.jboss.tools:parent:pom:4.5.1.Final-20171017.105727-25 from/to jboss-snapshots-repository (https://repository.jboss.org/nexus/content/repositories/snapshots/): Connection reset and 'parent.relativePath' points at wrong local POM @ line 5, column 10 -> [Help 2]
  

• in jbosstools-openshift: https://dev-platform-jenkins.rhev-ci-vms.eng.rdu2.redhat.com/job/jbosstools-openshift-Pull-Request/1120/console

  [ERROR]   The project org.jboss.tools:openshift:3.4.1-SNAPSHOT (/mnt/hudson_workspace/workspace/jbosstools-openshift-Pull-Request/pom.xml) has 1 error
  [ERROR]     Non-resolvable parent POM org.jboss.tools:parent:4.5.1.Final-SNAPSHOT for org.jboss.tools:openshift:3.4.1-SNAPSHOT: Could not transfer artifact org.jboss.tools:parent:pom:4.5.1.Final-20171017.105727-25 from/to jboss-snapshots-repository (https://repository.jboss.org/nexus/content/repositories/snapshots/): Connection reset and 'parent.relativePath' points at wrong local POM @ line 4, column 10 -> [Help 2]