1.2.5.3 adds a new version of the netty library (3.4.2 → 3.5.11).
Recently, version 1.2.5.1 was released only with a security patch and 1.2.6 with all sinces 1.2.5 fixes. The same for 1.2.5.2 and 1.2.7.
Since then, version 1.2.5.3 has only been released with the netty update. There were no 1.2.8 releases containing all the other fixes. You have to check the problem that Karsten mentioned in order to check the commits in both versions to make sure that you have what you need with 1.2.7, because, as far as I can see, the net update is not in 1.2.7 yet
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