Reverse Proxy:
A reverse proxy is a server that sits in front of web servers and forwards client (e.g. web browser) requests to those web servers. Reverse proxies are typically implemented to help increase security, performance, and reliability.
A reverse proxy server is an intermediate connection point positioned at a network’s edge. It receives initial HTTP connection requests, acting like the actual endpoint.
what is x-forwarded-for in netscaler:
when you’re using a 3rd party reverse proxy such as CloudFlare you will see the IP address from the reverse proxy instead of the actual Client IP Address on your webserver.
What is the difference between running and saved configuration on NetScaler? A: A running configuration refers to the configuration currently running on a NetScaler system. The running configuration on a NetScaler can be seen by issuing the show ns runningconfig command in the Command Line.
A saved configuration shows the commands that have been issued through the NetScaler command line interface (CLI) or the NetScaler GUI and committed to save. The saved configuration on a NetScaler can be seen by issuing the show ns.
Configure Netscaler High Availability:
Configuring NetScaler in high availability mode allows your users to access their apps and desktops in case primary NetScaler fails for some reason. High availability checks for primary NetScaler availability. In case if it is not able to contact the primary NetScaler it immediately starts failover process and secondary NetScaler becomes primary and primary becomes secondary in high availability pair. When this happens all existing connections will be dropped and reconnected again.
Issue: vcenter certificate replaced. From thereon, Citrix studio cant connect to vcenter. Power control options grayed out in director and studio doesn’t show power options at all.
Troubleshooting: Hypervisor tests on the vcenter server url in studio->hosting tab, show that studio cant connect to vcenter because of certificate issue.
Solution:
Goto your vcenter url: https://vcenter.domain.com on IE, download the certificate in DER encoded cert format. Install it to trusted people, select show physical stores.
Issue: Citrix VDA is not registered.
Troubleshooting:
Checked Citrix services on the VDI. Citrix ICA service wasnt started. Throws error, “windows could not start the citrix ica service on local computer 1067” and fails to start.
Solutions:
On the VDI, check if authenticated users group is added to local administrators group. If you find it, remove it. Start ICA service and other citrix services. Restart citrix desktop service. On the VDI, check if local service account is added to local administrators group on the VDA.
Those who are on IOS 14 OS might have seen below prompt when opening apps. VNC Viewer is an example shown here. In IOS 14 we see similar prompt for almost all apps.
If you do not allow access for these apps to your local network, they wont work. In case if you have disabled access, goto settings, select the app and enable local network option.
While upgrading or installing linux OS from one version to another you might end up in below error. In my case, I tried to install linux mint 20 (Ulyana), and faced the error. Note: I have already disabled secure boot in my laptop.
I have downloaded Linux mint 20 ISO from their website and made it bootable with Rufus software (MBR partition scheme and BIOS or UEFI target system). Attached USB to laptop and installed Linux Mint 20.
When you try to add a vcenter connection under “Hosting” tab in Studio, you get the below error sometimes: Solution:
Open your vcenter server in IE, like, https://vcenterServer.yourcompany.com. You will see certificate error. Click on “Continue to this Website (not recommended). Click on Certificate error in the address bar. Click View certificates and install the certificate. Make sure you install it to Local machine and select “Trusted People” in certificate store dialog box.
Azure important points:
Use locks on critical resources. Use resource groups to segregate your resources into virtual groups so that they can be managed as a single entity. Create policy to set compliance and rules on your Azure resources. Use Initiatives if you have multiple policies. Even if you have a single policy today, It is recommended using initiatives. This will be helpful in future if you create more number of policies.
Azure Learning Links:
Azure Docs: https://docs.microsoft.com/en-us/learn/browse/
AZ-900:
https://docs.microsoft.com/en-us/learn/paths/azure-fundamentals/
https://github.com/ddneves/awesome-azure-learning/blob/master/topics/certifications/az-900.md
https://azure.microsoft.com/en-ca/community/events/ - Change country and select course.
https://microsoft.github.io/AzureTipsAndTricks/
Windows Virtual Desktop:
WVD Introduction: https://docs.microsoft.com/en-us/learn/paths/m365-wvd/
Youtube playlist: Azure Academy
