In a notice made by PlayStation UK, it has been revealed that Sony will cease support for Gran Turismo 5. Worldwide online functionality will no longer be available from May 20th, 2014. The announcement also includes server termination dates of other long-running PS3 titles:
Important notice for all PlayStation 3, PlayStation Vita, PlayStation 2 and PSP owners regarding online games.
As of 30 May 2014 you will no longer able to use the online features of the following game:
Gran Turismo 5
As of 28 March 2014 you will no longer able to use the online features of the following games:
Resistance: Fall of Man
As of 26 November 2013 you will no longer able to use the online features of the following game:
As of 28 January 2014 you will no longer be able to use the online features of the following games:
SOCOM: Special Forces
After these dates, you will still be able to play these games offline, with the exception of MAG and SOCOM: Confrontation, which do not have offline modes.
We would like to thank everyone who has taken part in these PlayStation online communities and hope you enjoyed them.
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Thanks to oniichan for the quick tip!