Support for syslink Xandria 5.1 ends on January 31, 2016.
syslink Xandria 5.1 was released in March 2012 and reaches the end of its life cycle. There will be no more patches for this version after January 31, 2016.
For the upgrade to the upcoming version syslink Xandria 6.0 it is required to run the current version syslink Xandria 5.2.