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Openbsd

OpnBSD PPTP Client: Install and Create a VPN

I work form home, and I need to login into our corporate network (Microsoft based PPTP server) using a pptp based vpn. How do I configure and setup up a PPTP VPN client under OpenBSD desktop / laptop or router / server operating systems?
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I brought a USB 2.0 wireless adapters based on the Ralink RT2700U, RT2800U and RT3000U chipsets. How do I configure and use it under OpenBSD operating systems?
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OpenBSD: HowTO Install Sets After Installation

How do I install a package set after install under OpenBSD operating systems? I forgot to add a file set comp52.tgz package. How do I install the same after installing the operating system?
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Linux / Unix ssh-keygen: Create A Host Key File

How do I create a host key file to use with my applications as I can not use system defined /etc/ssh/ssh_host_rsa_key for non-root account under Linux / Unix / Apple OS X / *BSD operating systems?
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I do not want to start ssh-agent and ssh-add as described here to manage my ssh keys for password less login. How do I install keychain software to manage my keys running on a Debian or Ubuntu based cloud server?
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I'm new to Linux and my boss told me to remove ssh server as we don't need to provide the remote login and file transfer capabilities of SSH. How do I disable and remove OpenSSH server?
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I'm using a Mac OS X and combination of ssh-agent+ssh-add to adds RSA or DSA identities to the authentication agent. ssh-agent provides me a secure way of storing the private key. However, I'd like to expire identities added to the agent within half an hour. How do I set lifetime of identities added to the agent under Unix / Linux / BSD / Apple OS X operating systems?
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