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...SH2_MSG_KEX_ECDH_INIT received'. There is increase of about 336221 - 150435 = ~185 msec. In contrast, we do not see such delay in receiving 'SSH2_MSG_KEX_ECDH_INIT received' with OpenSSH 8.6p1 Please let me know if you have any info on this. //OpenSSH 9.6p1 logs Jul 23 17:42:50.131032 ifav87-apic2 sshd[1089880]: debug1: Forked child 1090464. Jul 23 17:42:50.131409 ifav87-apic2 sshd[1090464]: debug1: Set /proc/self/oom_score_adj to 0 Jul 23 17:42:50.131668 ifav87-apic2 sshd[1090464]: debug1: rexec start in 4 out 4 newsock 4 pipe 6 sock 7 Jul 23 17:42:50.146955 ifav87-apic2 sshd[1090464]...

...for this case? > I enabled logging on the server side. I see the most of the increase > is here in receiving 'SSH2_MSG_KEX_ECDH_INIT received'. There is > increase of about 336221 - 150435 = ~185 msec. Here's the reason: > //OpenSSH 9.6p1 logs > Jul 23 17:42:50.150288 ifav87-apic2 sshd[1090464]: debug1: kex: > algorithm: sntrup761x25519-sha512 at openssh.com [preauth] > //OpenSSH 8.6p1 > Jul 23 17:32:24.932126 apic2 sshd[342983]: debug1: kex: algorithm: > curve25519-sha256 [preauth] OpenSSH 9.0 introduced a quantum resistant hybrid kex method as the highe...