I am running an OpenVPN 2.3.12 network with TCP protocol and 443 port to mimic https stream
After connection, I have random packet HMAC authentication failed every 2 or 3 minutes when receiving from Raspbian openvpn client thru a firewall . After each software reset the Raspbian client succeed to reconnect but again 2 or 3 minutes later another packet HMAC authentication failure occurs.
This firewall is filtering https url so i suspect my problem is coming from it.
( The openvpn server is running in a Raspberry 3 and working well with others clients ( Windows, Android) but another network without firewall in this case)
Is anybody an idea how to correct these random packet HMAC authentication failures ?
The messages from openvpn are:
14:43:30 2018 us=538741 xx.xx.xx.xx:42807 TCPv4_SERVER READ  from [AF_INET]xx.xx.xx.xx:42807: P_CONTROL_V1 kid=0 pid=[ #43 ] [ ] pid=7 DATA len=100
14:43:30 2018 us=538782 xx.xx.xx.xx:42807 Authenticate/Decrypt packet error: packet HMAC authentication failed
14:43:30 2018 us=538821 xx.xx.xx.xx:42807 TLS Error: incoming packet authentication failed from [AF_INET]xx.xx.xx.xx:42807
14:43:30 2018 us=538878 xx.xx.xx.xx:42807 ACK reliable_can_send active=0 current=0 : 
14:43:30 2018 us=538929 xx.xx.xx.xx:42807 ACK reliable_send_timeout 604800 
14:43:30 2018 us=538961 xx.xx.xx.xx:42807 Fatal TLS error (check_tls_errors_co), restarting
14:43:30 2018 us=538993 xx.xx.xx.xx:42807 SIGUSR1[soft,tls-error] received, client-instance restarting
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