The e-mail client will connect with your local Stunnel daemon, the Stunnel daemon will make an SSL connection to the remote Stunnel server (stunnel.example.com) and the Stunnel server will make a non-SSL connection to the original IMAP and SMTP servers.

[remote] client = yes accept = 8888 connect = google.com:443 I ended up using tstunnel.exe rather than stunnel.exe since that is the command line version of stunnel in Windows. Here's the command: tstunnel remote_stunnel.conf Also, if you have the server certificate on the client machine, you could use the "certificate pinning technique": remove the checkHost option and replace verifyChain with verifyPeer = yes. And stunnel.pem on the client machine must be the same as stunnel.pem on the server. Stunnel documentation contains some simple examples for this. At this point I started to dig into the stunnel source code and there I found the cause: Stunnel internally sets the maximum number of clients during its startup by using the soft limit on the number of open file descriptors. This is the specific formula that is used: stunnel プログラムは、クライアントとサーバー間の暗号化ラッパーです。 設定ファイルで指定されたポートをリッスンし、クライアントとの通信を暗号化し、通常のポートでリッスンしているオリジナルのデーモンにデータを転送します。 client = yes accept = 127.0.0.1:10000 connect = SERVER_IP:TUNNEL_PORT. Replace the SERVER_IP with the stunnel-specific IP address of the respective server. You can look it up in the overview of stunnel ports and IPs. For the STUNNEL_PORT you can choose between the following ports: 22, 53, 443, 8085, 9009, 36315. To circumvent blocking, ports 53

[remote] client = yes accept = 8888 connect = google.com:443 I ended up using tstunnel.exe rather than stunnel.exe since that is the command line version of stunnel in Windows. Here's the command: tstunnel remote_stunnel.conf

stunnel (“Secure Tunnel”) is a . multi-platform application used to provide a universal TLS/SSL tunneling service. It is sort of proxy designed to add TLS encryption functionality to existing clients and servers without any changes in the programs' code. Tunneling With stunnel. stunnel is tool that can be used to provide secure encrypted connections for clients or servers that do not speak TLS or SSL natively. We can use stunnel to bind to a port on localhost (e.g., 19200), which in turn will connect to Elasticsearch Service. Here is a sample configuration to achieve this: May 22, 2019 · systemctl enable stunnel@telnet.service Client Installation. This part of the article assumes you are logged in as a normal user (with sudo privileges) on the client system. Install stunnel and the telnet client: dnf -y install stunnel telnet. Copy the stunnel.pem file from the remote server to your client /etc/pki/tls/certs directory. In this Install stunnel on Windows. Download and install latest Windows stunnel client. Currently only 32-bit version is privoded and this is the latest release by the time of writing this tutorial. Configuring stunnel on Windows. By default config file is located at C:\Program Files (x86)\stunnel\config as stunnel.conf.txt. Edit the file and add the

stunnel プログラムは、クライアントとサーバー間の暗号化ラッパーです。 設定ファイルで指定されたポートをリッスンし、クライアントとの通信を暗号化し、通常のポートでリッスンしているオリジナルのデーモンにデータを転送します。 client = yes accept = 127.0.0.1:10000 connect = SERVER_IP:TUNNEL_PORT. Replace the SERVER_IP with the stunnel-specific IP address of the respective server. You can look it up in the overview of stunnel ports and IPs. For the STUNNEL_PORT you can choose between the following ports: 22, 53, 443, 8085, 9009, 36315. To circumvent blocking, ports 53