The Montana Department of Public Health and Human Services ( DPHHS ) is notifying clients and employees that unauthorized access was gained to a server that stored their personal data , including Social Security numbers and payroll information . How many victims ? Not yet determined , a spokesperson told SCMagazine.com on Tuesday . What type of personal information ? Names , addresses , dates of birth , dates of service , Social Security numbers and clinical information may have been compromised for clients . Names , Social Security numbers and bank account information may have been compromised for employees . What happened ? Unauthorized access was gained to a server that stored the personal information . What was the response ? Upon discovery of suspicious activity , DPHHS shut down the impacted server and contacted law enforcement . A new server containing backup files is being brought online . DPHHS has purchased additional software to better protect sensitive information . DPHHS policies and procedures are being reviewed . All impacted individuals are being notified and offered a free year of credit monitoring and insurance offered by the state . Details : A forensic investigation revealed that access was likely gained in July 2013 . DPHHS observed suspicious activity on May 15 and confirmed on May 22 that unauthorized access was gained to the server . Quote : Officials with the [ DPHHS ] said today that hackers gained entry to an agency computer server , though officials said there is no knowledge that information on the server was used inappropriately , or was even accessed , according to the notification posted on the website . Source : dphhs.mt.gov , DPHHS computer server inappropriately accessed , May 29 , 2014 . ;