Skype4Business / LYNC doesn't work for Android users since HAProxy upgrade

Help!
1

Hello dear community,

Since we’ve upgraded our Haproxy solution (HAProxy version 2.4.22), we noticed that Skype4Business / LYNC doesn’t work anymore… but only for Android users. All other devices (IOS for example) are not impacted by this problem.

Here is the actual configuration for Skype4Business/LYNC ou HAProxy:

frontend LYNC
# xx.xxx.xxx.xxx
bind 192.168.204.138:443 ssl crt /etc/haproxy/ssl/certif.pem
http-request set-header X-Forwarded-Port %[dst_port]
http-request add-header X-Forwarded-Proto https if { ssl_fc }
#rspirep ^Server:.+ Server:\ Apache #Hide server ID → OLD CONFIG
no option httpclose
no option http-server-close
option http-keep-alive
use_backend LYNC

backend LYNC
server xxxxxxxxxxxx 192.168.200.131:4443 ssl check port 443 check-ssl
server xxxxxxxxxxxx 192.168.200.132:4443 ssl check port 443 check-ssl
server xxxxxxxxxxxx 192.168.200.133:4443 ssl check port 443 check-ssl

Any idea why it doesn’t work for Android users ?
Thanks and BR !

2

Check TLS 1.3, Lync client doesn’t support TLS 1.3