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diff -up ./lib/ssl/sslsock.c.ssl2hello ./lib/ssl/sslsock.c
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--- ./lib/ssl/sslsock.c.ssl2hello	2022-06-08 18:56:58.420672624 -0700
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+++ ./lib/ssl/sslsock.c	2022-06-08 18:58:37.801318314 -0700
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@@ -90,7 +90,7 @@ static sslOptions ssl_defaults = {
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     .enableDtls13VersionCompat = PR_FALSE,
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     .enableDtlsShortHeader = PR_FALSE,
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     .enableHelloDowngradeCheck = PR_TRUE,
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-    .enableV2CompatibleHello = PR_FALSE,
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+    .enableV2CompatibleHello = PR_TRUE,
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     .enablePostHandshakeAuth = PR_FALSE,
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     .suppressEndOfEarlyData = PR_FALSE,
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     .enableTls13GreaseEch = PR_FALSE,