You probably had this output error while trying unmounting a drive/mount point on a Linux or Unix system : Device or resource busy Of course, you certainly need to make sure that no user or process are accessing this filesystem in any way. Even though you have taken every precaution, you still may have this… Read More »
Have you encountered the following error trying to connect to OpenVPN server? JSONDialog: Error running jsondialog, status=(5, [], [‘task_for_pid(): 0x5’]), stdout=[], I have observed the following error message under the following circumstances : Operating system : Mac OSX El Capitan 10.11 OpenVPN client : v2.0.18.202 or older version The problem occur because of the System… Read More »
If you had installed your RHEL/CentOS 5 system using LSILogic Parallel controller, you may have noticed the horrible I/O performance… You unfortunately cannot just change the controller type and expect your VM to boot. There is a few easy steps to ensure that the OS can boot with the new controller. FIRST thing FIRST :… Read More »
If you just have reconfigured your virtual machine hardware in vCenter and can see that the status is stuck at “In progress…” for a while (much longer than usual, even though waiting 30 minutes for something that should normally take 5 seconds), then you may be facing the bug I have seen in vCenter version… Read More »
You have noticed such behaviour in the system logs (/var/log/messages)? kernel: httpd invoked oom-killer: gfp_mask=0x201d2, order=0, oomkilladj=0 kernel: Call Trace: kernel: [<ffffffff800cb67d>] out_of_memory+0x8e/0x2f3 kernel: [<ffffffff8002e493>] __wake_up+0x38/0x4f kernel: [<ffffffff8000a7ea>] get_page_from_freelist+0x2/0x442 kernel: [<ffffffff8000f6a2>] __alloc_pages+0x27f/0x308 kernel: [<ffffffff8001308d>] __do_page_cache_readahead+0x96/0x17b kernel: [<ffffffff800139d6>] filemap_nopage+0x14c/0x360 kernel: [<ffffffff80008972>] __handle_mm_fault+0x1fd/0x103b kernel: [<ffffffff8000c795>] _atomic_dec_and_lock+0x39/0x57 kernel: [<ffffffff800671ae>] do_page_fault+0x499/0x842 kernel: [<ffffffff8005ddf9>] error_exit+0x0/0x84 Additionally, the system was hanging/very… Read More »
Having the following error trying to apply IP restriction in the ESXi firewall using the vSphere client? Call “HostFirewallSystem.UpdateRuleset” for object “firewallSystem” on ESXi “0.0.0.0” failed. Operation failed, diagnostics report: Sysinfo error on operation returned status : Already exists. Please see the VMkernel log for detailed error information This behaviour can happen under the following… Read More »
If you tried to upgrade your Juniper SSG ScreenOS version lately using the WebUI and got the message “Failed to upgrade” and the console output showed : ********Invalid image!!! ********Bogus image – not authenticated!!! Fips check failed (This would output the same if you tried to manually upgrade from the console). This could indicate two… Read More »
It is fine to list users manually when you have a few, but can be just unthinkable when you have a thousand! Fortunately, PowerShell can make it easy for you. The following command will list all the users (even those who are disabled) with a lot of useful information. The command to use is :… Read More »
The following error may occur if you have requested a VM to be deleted from disk : A general system error occured: Input/output error In my particular case, the VM was up to 12 Tb and after a little while the operation was running, the error message above showed up in vCenter. The virtual machine… Read More »
Have you encountered the following error while doing upload or delete operation with vsFTPd server? 550 Permission denied error Open your vsFTPd configuration file : /etc/vsftpd/vsftpd.conf Or : /etc/vsftpd.conf 1. Locate the following parameter : write_enable=YES Set to YES or make sure it is not commented # (remove comment and reload the daemon). 2. If… Read More »