Remove Firewall rules from vCenter Server Appliance 6.7

I am completely stupid, I fiddled with firewall settings of VCSA and now I am locked out. What do I do?

Don’t worry, it can be fixed. But first, we need to get in. Since you are locked out of the web interface, you will need to use the Shell. Log in to the host, where the VCSA virtual machine resides and open up the console.

Press ALT + F1 , write shell and hit ENTER. Fill in your root credentials.

Use this command to list all rules:
iptables -L --line-numbers | more

Your firewall rules are listed under “Chain inbound”, note their numbers.

Now delete the rule(s), which are preventing you to connect to the server with this command (this example deletes rule number 2):
iptables -D inbound 2

The change should have immediate effect, so you can try to ping the server and see if it worked.

If this fix worked, you should login via web interface, which is now accessible, and delete firewall rules from there, or they will activate again after reboot.

SHOULD I INSTALL KB4486459?

Is it for me?

It depends, the update is meant for following operating systems:

  • Windows Server 2012 R2
  • Windows 8.1
  • Windows RT 8.1
  • Windows Server 2012
  • Windows Server 2008 R2 Service Pack 1 (SP1)
  • Windows 7 SP1
  • Windows Server 2008 Service Pack 2 (SP2)

What does it do?

This patch updates operating system with new daylight saving time for Chile.

Do I need it?

Unless you are in Chile, probably not.

Should I install KB4462177?

The KB4462177 security update mainly patches up security hole in Microsoft Office 2010. It is meant for standalone version of Office 2010 only, not for Click-to-run edition or Office 365 Home.

What does it do?

There is a vulnerability in Microsoft Excel (CVE-2019-0669) which could be exploited to disclose contents of memory. The attacker could create a special malicious document and persuade victim to open it. This update changes how Excel handles objects in memory.

It also prepares your software to enable the new era in Japanese calendar.

Do I need it?

Since it fixes known and exploitable vulnerability, yes, I would install it as soon as possible.

Warface: The parameter is incorrect error

My game stopped working after Windows 10 update about half a year ago. The support was no help at all and I couldn’t find anything useful on the internet. Today I decided to give it another try. And I got it working again.

There were 2 errors I was getting trying to launch the game. One said its “not 32bit application” and other “the parameter is incorrect”.

There is a workaround, just disable “core isolation”, which is a security feature of Windows 10. I have to warn you, you may be compromising your security to play a poorly programmed game. You can find out what exactly core isolation is and how to disable it here. Don’t forget to restart your computer after.

PatchCleaner – clean up the windows/installer directory

Imagine you are in my shoes. I have 120 GB SSD with 10 GB of free space. The computer was installed 4 years ago and later upgraded to Windows 10. I install and uninstall a lot of stuff. I found out that folder “installer” hidden in my “windows” directory is taking up 18 GB. What can I delete safely?

PatchCleaner, freeware tool by HomeDev, comes to rescue.

The installer folder contains files needed to uninstall or update your software. PatchCleaner compares those files with the list your Windows is keeping and determines which of them are no longer needed. Then you can simply delete them (or move them) to reclaim your precious space. I got back 14 GB of 18 GB in the installer folder, neat, isn’t it?

Some of you will surely appreciate you can run PatchCleaner easily from the command line, with event log output and all. Great way to set up a scheduled task and forget it.

There are basically only 2 switches:

/d - execute and delete files
/m - execute and move to the standard location
/m [FilePath] - execute and move to your chosen location