mac connection issues
go to KeyChain Access. If you are using certificate for connection, there may be extraneous entries in the “login” section (left hand side). Remove them.
Category Archives : Sys admin
block ip from ssh
/etc/hosts.deny ALL: 23.234.61.51 (substitute all for whatever daemon name)
vi utf unicode characters
If vi shows garbled unicode/utf-8 characters Put in ~/.vimrc : :set encoding=utf-8 :set fileencodings=utf-8 To debug vi, check ~/.vminfo which is generated each time vi starts. It shows your encoding, etc.
windows 7 32 bit to 64 bit upgrade
windows 7 32 bit to 64 bit “upgrade” (reinstall really). Same product key will work.
Chromecast “no cast devices found”
Disable any virtual network adapters in device manager (like from virtualbox).
convert ^M to newline
for whatever reason, dos2unix nor unix2dos works. So, vi the file, :%s/^V^M/^V^M/g ^V^M = control V control M g at the end means global (i.e. not only first occurrence.
Drupal slow
change /etc/hosts. For every entry related to local host (INCLUDING ipv6 entries), map to localhost, e.g.: ::1 localhost #ip6-localhost ip6-loopback fe00::0 localhost #ip6-localnet ff00::0 localhost #ip6-mcastprefix ff02::1 localhost #ip6-allnodes ff02::2 localhost #ip6-allrouters
restrict sshd users
in /etc/ssh/sshd_config (on some systems it is simply /etc/sshd_config) add: AllowUsers root AllowUsers joe Note that as soon as you enable one AllowUsers option, no users can login unless they are listed. In other words, despite the PermitRootLogin setting, if you do not set “AllowUsers root” and have “AllowUsers joe” in your configuration, root cannot log in even with a […]
cygwin: add user (for ssh in my case)
install cygwin. setup ssh server: From cygwin: ssh-host-config -y add user to windows in cygwin, run: mkpasswd -l > /etc/passwd Also, run mkgroup -l > /etc/group More info on setting up ssh server: http://www.noah.org/ssh/cygwin-sshd.html
Mac OS missing ~/Library directory
Apple hides it so you can’t shoot yourself in the foot. To show it permanently in finder: chflags nohidden ~/Library/ To hide it: chflags hidden ~/Library You can show it temporarily in the Go menu by clicking on option.