--- title: Release Notes - C++ FIX Engine - Version 3.20.0.0 description: Release Notes - C++ FIX Engine - Version 3.20.0.0 --- [OnixS ](https://www.onixs.biz/) - [Products](https://www.onixs.biz/products.html) - [Support](https://www.onixs.biz/support.html) - [Contact us](https://www.onixs.biz/contact-us) Search Menu # Release Notes - C++ FIX Engine - Version 3.20.0.0 - [Home](https://www.onixs.biz) - [Release Notes](https://www.onixs.biz/release-notes/) 25 Jan 2016 ## New Feature - [[CPP-2193](http://support.onixs.biz/browse/CPP-2193)] - EngineSettings::asyncFileBasedStorageThreadAffinity - [[CPP-2139](http://support.onixs.biz/browse/CPP-2139)] - EngineSettings::logOutboundMessages - [[CPP-2138](http://support.onixs.biz/browse/CPP-2138)] - EngineSettings::logInboundMessages - [[CPP-2083](http://support.onixs.biz/browse/CPP-2083)] - Support Visual Studio 2015 - [[CPP-2079](http://support.onixs.biz/browse/CPP-2079)] - Session::incomingMessageGapQueueMaximumSize - [[CPP-2070](http://support.onixs.biz/browse/CPP-2070)] - Session::ignoreLessThanExpectedSequenceNumber option - [[CPP-2018](http://support.onixs.biz/browse/CPP-2018)] - EngineSettings::receiveSpinningTimeout ## Improvement - [[CPP-2184](http://support.onixs.biz/browse/CPP-2184)] - Describe a timeout, which is used to wait Logon/Logout response. - [[CPP-2174](http://support.onixs.biz/browse/CPP-2174)] - “Reconnection Facility” article should be added to Programing Guide - [[CPP-2156](http://support.onixs.biz/browse/CPP-2156)] - Improve the id generation when the QuickFIX dialect is used - [[CPP-2125](http://support.onixs.biz/browse/CPP-2125)] - Add "Customizing Logging" topic to Programming Guide - [[CPP-2124](http://support.onixs.biz/browse/CPP-2124)] - All configuration settings should be present in the “Complete Reference of Configuration Settings” page - [[CPP-2116](http://support.onixs.biz/browse/CPP-2116)] - Information about the logging order of incoming messages should be added to Programming Guide - [[CPP-2109](http://support.onixs.biz/browse/CPP-2109)] - EngineSettings::specifyApplVerIdField - [[CPP-2108](http://support.onixs.biz/browse/CPP-2108)] - SBE Decoding and Encoding should be described in Programming Guide - [[CPP-2092](http://support.onixs.biz/browse/CPP-2092)] - Describe settings which allow user create a maximum number of sessions - [[CPP-2085](http://support.onixs.biz/browse/CPP-2085)] - Message::validate(MessageValidationFlags) method should validate required fields for the application level only - [[CPP-2056](http://support.onixs.biz/browse/CPP-2056)] - Improve warm-up effect when Solarflare's Onload is used ## Bug - [[CPP-2181](http://support.onixs.biz/browse/CPP-2181)] - Session::logout is stuck when Session::breakConnection is called in LogoutInProgress state - [[CPP-2163](http://support.onixs.biz/browse/CPP-2163)] - Session does not store FIX messages of the gap continuation on certain condition - [[CPP-2161](http://support.onixs.biz/browse/CPP-2161)] - Unexpected “MsgSeqNum too low” exception - [[CPP-2113](http://support.onixs.biz/browse/CPP-2113)] - BREAKING CHANGE: Errors in standard FIX dictionaries - [[CPP-2066](http://support.onixs.biz/browse/CPP-2066)] - FIX Engine requests the received message when requestOnlyMissedMessages is true, on certain conditions ### Related articles [See all release notes](https://www.onixs.biz/release-notes/) 28 Apr 2025 ##### [ Release Notes - FIX Engine C++ - Version 4.13.0 ](https://www.onixs.biz/release-notes/release-notes-fix-engine-c-version-4-13-0.html) 13 Nov 2024 ##### [ Release Notes - FIX Engine C++ - Version 4.12.0 ](https://www.onixs.biz/release-notes/release-notes-fix-engine-c-version-4-12-0.html) 28 May 2024 ##### [ Release Notes - FIX Engine C++ - Version 4.11.0 ](https://www.onixs.biz/release-notes/release-notes-fix-engine-c-version-4-11-0.html) 22 Jan 2024 ##### [ Release Notes - FIX Engine C++ - Version 4.10.1 ](https://www.onixs.biz/release-notes/release-notes-fix-engine-c-version-4-10-1.html) 27 Dec 2023 ##### [ Release Notes - FIX Engine C++ - Version 4.10.0 ](https://www.onixs.biz/release-notes/release-notes-fix-engine-c-version-4-10-0.html) ### Other recent articles [See all release notes](https://www.onixs.biz/release-notes/) 8 Jul 2026 ##### [Release Notes - 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