When an NFS share gets hung and a standard ‘umount /mnt/share’ yields something like:
umount.nfs: 10.1.1.15:/nfs/share: not found / mounted or server not reachable
Try to force it with a ‘lazy’ unmount (umount):
umount -l /mnt/share
Jun 23
Force unmount (umount) of a hung NFS share
Linux
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Jun 11
Allow passive FTP on ProFTPD
Linux
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Most FTP clients attempt to use passive FTP by default. Passive FTP is not enabled on ProFTPD. Fortunately, enabling it is very simple. Edit /etc/proftpd.conf and add ‘PassivePorts <low port> <high port>’ to the first section (global), then restart ProFTPD. You should use a really high port range to avoid conflicts. For example, you might want to add:
‘PassivePorts 63121 63129’
The number of ports needed is determined by the number of simultaneous FTP clients you expect to have.
If you are running a firewall, you may need to allow these ports in to your server. This will depend on the firewall – some will view this traffic as related, some will not.
Jun 10
Re-create PIX/ASA certificate after getting sec_error_reused_issuer_and_serial error in browser
Firewall
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If you receive the following error, ‘Error: sec_error_reused_issuer_and_serial’, in Firefox when attempting to connect to a Cisco PIX or ASA firewall, connect to the firewall via the console or SSH and issue the following commands in configuration mode:
ca zeroize rsa
ca generate rsa key
where is 512, 1024, or whatever bit-size you feel that the key should be (I would suggest 1024).
The key will be re-generated and you should be able to connect to the firewall and launch PDM or ASDM via the browser.
