The Salesforce Technology team is currently investigating a service disruption impacting a small subset of Pardot accounts as of 10.27 a.m GMT. During a service disruption, end users are unable to access the Pardot service. Updates will be posted here as new information becomes available.
Update as of 10.59 a.m GMT: The service disruption impacting a small subset of Pardot accounts has been resolved and full service has been restored. Please contact Support at http://success.pardot.com
if you encounter any further issues. We sincerely regret any inconvenience you have experienced as a result of this incident.