![]() In addition, if you have been receiving indiscriminate attack attempt packets targeting IPsec VPN devices, which have been occurring frequently on the Internet since around August 2021, and have been experiencing reduced communication speed or failed VPN connections for legitimate users, we recommend that you apply the update. If you are using the system with L2TP/IPsec, EtherIP/IPsec or L2TPv3/IPsec features enabled, we recommend that you apply the update.This RTM build includes all changes from the previously released Beta versions, Build 9754 and Build 9758.Improve the stability of IPsec function with reducing consuming CPU time / network bandwidth / memory consumption even if your server receive a large number of IPsec packets from indiscriminate attack attempts (brute force attacks, reflection attacks, etc.) targeting generic IPsec VPN devices, which have been occurring frequently on the Internet recently.Now automatic retry will be stopped after specified number of retries even if there is an authentication error when connecting.Īdded support for V_ASN1_GENERALIZEDTIME notation for certificate expiration dates. Limit key usage of server certificates when creating X.509 certificates.All cumulative updates bellow are included. ![]() Since this is an OS-side problem that is difficult to fix, we have rewritten the user mode program to use only the normal Mutex Lock instead of the RW Lock to work around this problem. This problem was an OS-side defect and only occurred on at least Ubuntu 20.04 or later Linux distributions and the 圆4 version. This problem was caused by a glitch on the OS side. However, there is a bug in the RW Lock of pthreads included in recent Linux distributions that, when handling thousands of sessions on a single server, would cause all CPUs to suddenly enter a spinlock interactive wait state, consuming an extremely long amount of CPU time, making VPN communication sessions difficult to communicate with, and causing VPN sessions to disconnect due to timeouts.
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