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Linux Tips
Prevent unauthorized access to Webmin (or FreePBX or any other service)
I have my PBX configured, so I can only access my FreePBX web interface and my webmin from within my network, or from ON the machine itself… however, I occasionally need to access it when I am not in my office, and here is a GREAT way to do it:
((The following example is assuming you are using a windows desktop, and using Putty to connect to your server via SSH, and that you currently have iptables configured for firewall blocking (why wouldn’t you), and you are know what ports your services are running on. If you have a linux desktop, try: ssh -L 80:localhost:80 user@remotemachine))
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Using Screen for Session Mgmt (Never have your upgrade/installation die because you lost your connection!)
Ever had a remote SSH connection where you were doing an upgrade (say to asterisk or pbxinaflash, etc) and you lost your internet connection, which killed your ssh session, and stopped your compile, leaving your system in a horribly unusable state? NEVER AGAIN! That is what I use screen for!
This will quickly become your FAVORITE AND REGULARLY USED LINUX UTILITY!!!
What is Screen?
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Setting Network Card Duplex Settings
Note: This should be read completely before you try this, as it could cause you to lose connectivity to the server if your network doesn't support it!
Many of the asterisk servers you may install/deploy are going to be setup in someone else's network, who likely doesn't have a linux engineer, and you may not be one, so this is for you. Even experienced linux engineers often miss the little things, and this is one of them!
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