Sony is asking an unspecified number of PlayStation Network customers to change their passwords after finding "irregular activity" in a routine scan of the system.
The company did not disclose how many users were affected, nor what the exact nature of the activity was.
"The Sony Entertainment Network team routinely monitors for any irregular activity, and if such activity is detected, we may sometimes reset passwords of affected accounts to protect consumers and their account information," the company said in a note to affected users. "Your account password was recently reset as part of this process and you will need to create a new password the next time you access your account using the 'Forgot Your Password' option on the Sign in screen."
In resetting the passwords, Sony also cautioned users to "keep a close eye on [their] account for any unusual activity including emails about transactions [they] did not perform."
While any request to reset a password is likely to spark concern among users, Sony is particularly vulnerable to speculation after a massive security breach two-and-a-half years ago saw personal information for over 100 million customer accounts stolen.
In a statement to Joystiq, however, the company said the decision to reset the passwords was not prompted by an attack or known vulnerability to its servers.
The 2011 hacking of the Sony Network was breathtaking in scope and was one of the largest cyber attacks of all time. Three suspects, who were arrested in Spain several months after the attack, were considered to be high-ranking members of the international hacker collective Anonymous.
Since then, the company has recruited former US Homeland Security official Phillip Teitinger to become its Chief Information Security Officer and protect against future attacks.
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