When opening Traces tab or Distributed Tracing menu item, it asks to accept the certificate.
After certificate acceptance, it asks OpenShift login.
Happens because traces in opened in an IFrame.

This is a well known issue in OpenShift Service Mesh 1.0 GA.

Original JIRA:
https://issues.jboss.org/browse/KIALI-3262

Related to:
https://issues.jboss.org/browse/MAISTRA-873

It won't be fixed in Kiali v1.0.6 / OpenShift Service Mesh 1.0.1 GA as it may require a change in how Kiali embeds Jaeger, so it's postponed to OpenShift Service Mesh 1.1.