X-Git-Url: https://git.exim.org/exim.git/blobdiff_plain/c8f419afe4b673ce93b7db07eb3093d8a07afb5f..bec360ab3e1060187724480d109884e56f912b0a:/test/scripts/4069-pipe-conn-openssl-tfo/4069

diff --git a/test/scripts/4069-pipe-conn-openssl-tfo/4069 b/test/scripts/4069-pipe-conn-openssl-tfo/4069
index 2339b0c12..41ec3a5ae 100644
--- a/test/scripts/4069-pipe-conn-openssl-tfo/4069
+++ b/test/scripts/4069-pipe-conn-openssl-tfo/4069
@@ -1,9 +1,13 @@
 # early-pipe, starttls, tfo
 #
+# NOTE: ensure that TFO is fully enabled in the kernel.
+# For linux: sysctl net.ipv4.tcp_fastopen=3
+# 
 # Network delay so we can see tfo efects
 # Clear any previously-obtained tfo cookie:
 sudo perl
 system ("tc qdisc add dev lo root netem delay 50ms");
+system ("[ -e /proc/sys/net/ipv4/tcp_fastopen_blackhole_timeout_sec ] && echo 0 > /proc/sys/net/ipv4/tcp_fastopen_blackhole_timeout_sec");
 system ("ip tcp_metrics delete 127.0.0.1");
 ****
 #