Hi!
I'm working on a tool assessing my OpenVPN server and to speed up the process 
I'm trying to establish multiple OpenVPN connections between a single client 
and my OpenVPN server.

All established connections should share the configuration and client keys on 
the client.

Without any special adjustments or modification I get the following error 
(timestamps and IPs omitted/redacted):


    OpenVPN 2.4.0 [git:master/f5bf296bacce76a8+] x86_64-pc-linux-gnu [SSL 
(OpenSSL)] [LZO] [LZ4] [EPOLL] [PKCS11] [MH/PKTINFO] [AEAD] built on Dec 29 2016
    library versions: OpenSSL 1.0.2k  26 Jan 2017, LZO 2.08
    TCP/UDP: Preserving recently used remote address: [AF_INET] 127.0.0.2:443
    TCP/UDP: Socket bind failed on local address [AF_INET][undef]:443: Address 
already in use
    Exiting due to fatal error


The server configuration looks as follows for the moment:
     server 172.16.0.0 255.255.255.0
     port 443
     proto udp
     dev tun
     ca /etc/openvpn/server/ca.crt
     cert /etc/openvpn/server/server.crt
     key /etc/openvpn/server/server.key
     dh /etc/openvpn/server/dh4096.pem
     tls-crypt /etc/openvpn/server/tls-crypt.key
     tls-version-min 1.2
     tls-cipher TLS-DHE-RSA-WITH-AES-256-GCM-SHA384
     cipher AES-256-CBC
     auth SHA512
     verb 3
     comp-lzo
     duplicate-cn

Is there any way to establish multiple connections from a single client to a 
single server?

Kind regards,
SaAtomic

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