Do I need to be concerned about this? I was reviewing my network activity and noticed my qbittorrentvpn docker (labelled as BitTorrent application) correctly showed the port used for incoming connections in Qbittorent (44203). As you can see it was only for 1 second and then switched to port 443 through the vpn configuration.
Docker log (VPN IP xxx)
-A INPUT -s 172.17.0.0/16 -d 172.17.0.0/16 -j ACCEPT
-A INPUT -s xxx.xxx.xxx.xx/32 -i eth0 -j ACCEPT
-A INPUT -i eth0 -p tcp -m tcp --dport 8091 -j ACCEPT
-A INPUT -i eth0 -p udp -m udp --dport 8091 -j ACCEPT
-A INPUT -p icmp -m icmp --icmp-type 0 -j ACCEPT
-A INPUT -i lo -j ACCEPT
-A INPUT -i tun0 -j ACCEPT
-A OUTPUT -d xxx.xxx.xxx.xx/32 -o eth0 -j ACCEPT
-A OUTPUT -s 172.17.0.0/16 -d 172.17.0.0/16 -j ACCEPT
-A OUTPUT -d xxx.xxx.xxx.xx/32 -o eth0 -j ACCEPT
-A OUTPUT -o eth0 -p tcp -m tcp --sport 8091 -j ACCEPT
-A OUTPUT -o eth0 -p udp -m udp --sport 8091 -j ACCEPT
-A OUTPUT -p icmp -m icmp --icmp-type 8 -j ACCEPT
-A OUTPUT -o lo -j ACCEPT
-A OUTPUT -o tun0 -j ACCEPT
2024-06-10 16:00:05,544 DEBG 'start-script' stdout output:
--------------------
2024-06-10 16:00:05,545 DEBG 'start-script' stdout output:
[info] Starting OpenVPN (non daemonised)...
2024-06-10 16:00:05,565 DEBG 'start-script' stdout output:
2024-06-10 16:00:05 DEPRECATED OPTION: --cipher set to 'AES-128-CBC' but missing in --data-ciphers (AES-256-GCM:AES-128-GCM:CHACHA20-POLY1305). OpenVPN ignores --cipher for cipher negotiations.
2024-06-10 16:00:05,566 DEBG 'start-script' stdout output:
2024-06-10 16:00:05 WARNING: file 'credentials.conf' is group or others accessible
2024-06-10 16:00:05 OpenVPN 2.6.10 [git:makepkg/ba0f62fb950c56a0+] x86_64-pc-linux-gnu [SSL (OpenSSL)] [LZO] [LZ4] [EPOLL] [PKCS11] [MH/PKTINFO] [AEAD] [DCO] built on Mar 20 2024
2024-06-10 16:00:05 library versions: OpenSSL 3.3.0 9 Apr 2024, LZO 2.10
2024-06-10 16:00:05,566 DEBG 'start-script' stdout output:
2024-06-10 16:00:05 DCO version: N/A
2024-06-10 16:00:05,567 DEBG 'start-script' stdout output:
2024-06-10 16:00:05 NOTE: the current --script-security setting may allow this configuration to call user-defined scripts
2024-06-10 16:00:05,567 DEBG 'start-script' stdout output:
2024-06-10 16:00:05 TCP/UDP: Preserving recently used remote address: [AF_INET]xxx.xxx.xxx.xx:443
2024-06-10 16:00:05,567 DEBG 'start-script' stdout output:
2024-06-10 16:00:05 UDPv4 link local: (not bound)
2024-06-10 16:00:05 UDPv4 link remote: [AF_INET]xxx.xxx.xxx.xx:443
2024-06-10 16:00:05,743 DEBG 'start-script' stdout output:
2024-06-10 16:00:05 [server] Peer Connection Initiated with [AF_INET]xxx.xxx.xxx.xx:443
2024-06-10 16:00:06,936 DEBG 'start-script' stdout output:
2024-06-10 16:00:06 TUN/TAP device tun0 opened
2024-06-10 16:00:06 net_iface_mtu_set: mtu 1500 for tun0
2024-06-10 16:00:06 net_iface_up: set tun0 up
2024-06-10 16:00:06,937 DEBG 'start-script' stdout output:
2024-06-10 16:00:06 net_addr_ptp_v4_add: 10.9.0.89 peer 10.9.0.90 dev tun0
2024-06-10 16:00:06 /root/openvpnup.sh tun0 1500 0 10.9.0.89 10.9.0.90 init
2024-06-10 16:00:06,938 DEBG 'start-script' stdout output:
2024-06-10 16:00:06 Initialization Sequence Completed
2024-06-10 16:00:23,119 DEBG 'start-script' stdout output:
[info] Attempting to get external IP using 'http://checkip.amazonaws.com'...
2024-06-10 16:00:41,231 DEBG 'start-script' stdout output:
[info] Failed on last attempt, attempting to get external IP using 'http://whatismyip.akamai.com'...
2024-06-10 16:00:41,691 DEBG 'start-script' stdout output:
[info] Successfully retrieved external IP address xxx.xxx.xxx.xx
2024-06-10 16:00:41,692 DEBG 'start-script' stdout output:
[info] VPN provider 'custom' not supported for automatic port forwarding, skipping incoming port assignment
2024-06-10 16:00:41,720 DEBG 'watchdog-script' stdout output:
[info] qBittorrent listening interface IP 0.0.0.0 and VPN provider IP 10.9.0.89 different, marking for reconfigure
2024-06-10 16:00:41,723 DEBG 'watchdog-script' stdout output:
[info] qBittorrent not running
2024-06-10 16:00:41,724 DEBG 'watchdog-script' stdout output:
[info] qBittorrent config file already exists, skipping copy
[info] Removing session lock file (if it exists)...
2024-06-10 16:00:41,736 DEBG 'watchdog-script' stdout output:
[info] Attempting to start qBittorrent...
2024-06-10 16:00:41,739 DEBG 'watchdog-script' stdout output:
[info] qBittorrent process started
[info] Waiting for qBittorrent process to start listening on port 8091...
2024-06-10 16:00:42,058 DEBG 'watchdog-script' stdout output:
[info] qBittorrent process listening on port 8091