Timothy,

Great answer. 

A little more difficult to implement.

Thanks!

David Ringsmuth

From: Timothy Penner via 4D_Tech
Sent: Wednesday, March 29, 2017 4:32 PM
To: Timothy Penner via 4D_Tech
Cc: Timothy Penner
Subject: RE: 4D 15.3HF1 OSX 10.12.4 - is 4D v15.4 the best answer.

Hi David,

Honestly I focused on the v15.3HF1 vs 15.4 on macOS 10.12.x part of the 
question and completely missed that mention DDOS at all… Sorry.

To be clear though, there is no v15.5 (yet) - there is a v15.4HF2 released a 
few days ago.
The DDOS thread was solved by using v15R5 however this was certainly not (to my 
knowledge) on Sierra.

Strictly speaking about macOS Sierra –
- You should be using either v16.0 or v15.4+ because these are the versions 
that are certified for macOS Sierra.
- V15.3/v15.3HF1 and v15R5 are not certified for macOS Sierra.  Here is the 
v15R5 cert matrix:
ftp://ftp-public.4d.fr/Documents/Products_Documentation/LastVersions/Line_15R5/VIntl/20160830_CertifV15_R5_INTL.pdf

Regarding the DDOS thread –
- I tested v15.4 (with a new db) using LOIC and I did not see an issue.
- Randy tested 15R5 (his db) using LOIC and his crashing went away (while his 
db crashed in v15.4 during the ddos).

My takeway from this is:
Is v15.4 inherently bad at dealing with ddos attacks? No I don’t think so since 
a new db didn’t crash, it seemed to be something specific to the db’s that 
crashed.
Is v15R5 inherently better at dealing with ddos attacks? Yes I think it is 
based on both Randy and Steve reports of their crashing going away with v15R5.
Is v15R5 a good match for macOS Sierra? No absolutely not. Use v16.x if you 
want the features of the v15R release on Sierra.

Kind Regards,

Tim PENNER



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