Fix: Skype for business error: There was a problem acquiring a personal certificate to sign in

How to fix Skype for business error: "There was a problem acquiring a personal certificate to sign in"

Step 1: Delete sign in information

• open skype
• click Delete my sign-in information
• re-login

Step 2: Delete certificate

• open a command prompt and run the following command:
• certmgr.msc
• Go to Personal/Certificates
• delete the certificate issued by Communications Server

Step 3: Flush the DNS cache

• open a command prompt and run the following command
• ipconfig /flushdns

Step 4: Delete sip folder

• delete your sip folder:
• Windows XP
• go to %USERPROFILE%\Local Settings\Application Data\Microsoft\Communicator<sip_YourEmailAddress>\
• Windows Vista/7/8/10
• go to %LOCALAPPDATA%\Microsoft\Communicator<sip_YourEmailAddress>\
• if you can't find the folder just search in %appdata% for SIP_ and delete that folder (it should look like this: sip_YourEmailAddress)

Uninstall/repair pending update [Windows 10]

Open a command prompt and run the command:

dism /image:C:\ /Cleanup-Image /revertpendingactions

CrowdStrike Windows Sensor: install location

C:\Windows\System32\drivers\CrowdStrike

CrowdStrike Windows Sensor: Check if service is running from command line

Run the following command:

sc query csagent

Flexible Single-Master Operations (FSMO) Roles

• PDC Emulator (One per domain)
• RID Master (One per domain)
• Schema Master (One per forest)
• Domain Naming Master (One per forest)
• Infrastructure Master (One per domain)
• Domain DNS Zone Master role (one per domain)
• Forest DNS Zone Master role (one per forest)

Map network drive from command line

Open command line and enter:

net use y: \\ServerName\SharedFolder /persistent:yes

Use the /persistent switch to restore the connection at next logon

Update Ubuntu to latest version from the Terminal

Open a terminal window and run:

sudo apt-get update
sudo apt-get upgrade
sudo apt-get dist-upgrade