iframe shows as blank page in Confluence


If your added iframe macro shows as a blank page in confluence page. I think there are two places you need to check. Ensure the site url (include protocol scheme) has been whitelisted. Check whether the site allows cross origin access. For example, *.sharepoint.com does not cross origin access by setting x-frame-option as SAMEORIGIN. Reference: … Continue reading iframe shows as blank page in Confluence

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Step by step to install SSL cert for Crowd server


In this article, I am going to show you how to install or renew SSL certificate for Crowd server step by step. Note: In my example, my hostname is crowd.jackiechen.org (skip if you already have your new certificate) Run the following command to generate a csr file for your certificate, and you will get two … Continue reading Step by step to install SSL cert for Crowd server

ERR_CERT_COMMON_NAME_INVALID because of Subject Alternative Name missing


If you are seeing similar errors in Chrome as below, your private cert probably missed the SAN. Starting from Chrome 58, it validates the DNS against the SAN that is in the certificate. Here is the quote that I found "Certificates have two ways to express the domain/IP they're bound to - one which is … Continue reading ERR_CERT_COMMON_NAME_INVALID because of Subject Alternative Name missing

BitLocker on Windows 10


Three quick commands to turn on/off and check BitLocker on Windows 10 Professional and Enterprise. You have to run the following commands in an Administrative terminal. To turn on BitLokcer against volume C:  manage-bde -on C: -RecoveryPassword -skiphardwaretest -UsedSpaceOnly To turn off BitLocker against volume C:  manage-bde -off C: To check BitLocker against volume C:  … Continue reading BitLocker on Windows 10

Enable Fingerprint login on Windows 10


It took me some time to get this one work, here are a couple of gotchas I learned. If the Fingerprint option is greyed out with a note '*Some settings are hidden or managed by your organization'. The fix is to update the registry key - [HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\System] "AllowDomainPINLogon"=dword:00000001  If the fingerprint sensor is not responding during … Continue reading Enable Fingerprint login on Windows 10

Certificate Transparency


Starting April 28, 2018,  AWS will start to support Certificate Transparency. I am new to this, here are somethings that I learned so far. What exactly is certificate transparency? Certificate Transparency framework is a project that is initially launched by Google. What problems does certificate transparency solve? It is designed to solved some flaws in the … Continue reading Certificate Transparency