OpenVPN clients cannot pass traffic when reconnecting using the same source port after upgrading to version 2.5.0

wesleylc1

Hi guys!

At the moment I'm having a lot of problems with the loss of the client's connection in OpenVPN, this problem started to occur after upgrading from version 2.4.5 to 2.5.0, under analysis on the client's computer, the OpenVPN connection has the status of connected , but does not respond to requests (ICMP) on the host on my remote network. At the same time, I checked the client's connection status on the firewall and it appears OK, in the OpenVPN Status also with connected session, as shown.

Note: * The client returns operational only when I click on delete the session in Diagnostics > States > States

Additional Information:

Before installing for version 2.5.0, I collected the route table used by my connection on the OpenVPN client, and according to the image, it is possible to identify that they were declared successfully for the client's computer.

The same problem occurred with another client, who in the analysis identified that he was using OpenVPN Client 2.4.9, so I removed and deleted the configuration files (C: \ Users \ user \ OpenVPN / “C: \ Program Files \ OpenVPN") , I finally installed the version of OpenVPN Client 2.5.0, as shown in the image below.

Version installed when the OpenVPN Client 2.4.9 problem occurred.

OpenVPN client connection log

2021-03-12 09:14:51 OpenVPN 2.5.0 x86_64-w64-mingw32 [SSL (OpenSSL)] [LZO] [LZ4] [PKCS11] [AEAD] built on Oct 28 2020
2021-03-12 09:14:51 Windows version 10.0 (Windows 10 or greater) 64bit
2021-03-12 09:14:51 library versions: OpenSSL 1.1.1h  22 Sep 2020, LZO 2.10
Enter Management Password:
2021-03-12 09:14:53 TCP/UDP: Preserving recently used remote address: [AF_INET]179.191.111.XXX:1194
2021-03-12 09:14:53 UDPv4 link local (bound): [AF_INET][undef]:1194
2021-03-12 09:14:53 UDPv4 link remote: [AF_INET]179.191.111.XXX:1194
2021-03-12 09:14:53 WARNING: this configuration may cache passwords in memory -- use the auth-nocache option to prevent this
2021-03-12 09:14:53 [OpenVPN-Server] Peer Connection Initiated with [AF_INET]179.191.111.XXX:1194
2021-03-12 09:14:54 open_tun
2021-03-12 09:14:54 tap-windows6 device [OpenVPN TAP-Windows6] opened
2021-03-12 09:14:54 Set TAP-Windows TUN subnet mode network/local/netmask = 10.0.8.0/10.0.8.29/255.255.255.128 [SUCCEEDED]
2021-03-12 09:14:54 Notified TAP-Windows driver to set a DHCP IP/netmask of 10.0.8.29/255.255.255.128 on interface {BB8BAF56-6270-4934-8731-7BAB3FAB882B} [DHCP-serv: 10.0.8.126, lease-time: 31536000]
2021-03-12 09:14:54 Successful ARP Flush on interface [24] {BB8BAF56-6270-4934-8731-7BAB3FAB882B}
2021-03-12 09:14:54 IPv4 MTU set to 1500 on interface 24 using service
2021-03-12 09:15:00 Initialization Sequence Completed
2021-03-12 09:15:00 Register_dns request sent to the service

Best Regards,
Wesley