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Sitecore 10.2 - The Ghost 500 Error that Comes and Goes - How PrefetchData ends into Race Condition and Cache Corruption

Hello Friends, I believe this blog post is very important for everyone who is running Sitecore 10.2, because this is one of those issues which is very tricky to catch, very scary when you see it live, and very satisfying when you finally understand what is happening underneath. I will share my experience of what we faced, how we did a deep reverse engineering of Sitecore kernel, what we found and how we resolved it. Issue we started facing Our customer were sending new page publish in email and sms communication campaigns, and when someone clicks on that link it used to give 500 screen and on refresh it used to work, but first hit was giving 500 and user drop was happening, and because of this when we hit it, it always used to work so it was  Our site started giving intermittent 500 errors with YSOD like following two exceptions Exception 1:  Index was outside the bounds of the array. System.IndexOutOfRangeException: at System.Collections.Generic.List`1.Add (mscorlib,...
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Hell of sitecore aliases pipeline breaking the site with 500 error

Hello Friends, I belive this blog post is very important for everyone because, It has some very serious effect on working of your headless website, i will share my experience what we faced and how we resolved it Issue we started facing Our site started giving "Key cannot be null or empty" with YSOD like following  Side affect Because of this 500 error, Our site pages were showing 500 custom error page intermittently and our MAU (Monthly Active User) drop rate increased. Sitecore KB There is already Sitecore KB article talking about this error but the patch which is provided on this link is confusing as well as very huge and it could bring other issues along with it as that upgrade patch also has lot of other things too which i did not want to introduce in our stable CMS. Known Issues - Retrieving the child items of resource items is not thread-safe Observation Though the surfaced exception was looking similar and giving same error and behavior given on this article, We looked...

Why SitecoreAI - Getting into the shoes of the customer how to select right CMS

Hi Team, Lately, I have been talking to lot of our customers / potential customers and having pre-sales demos where one question always comes is "Why Sitecore" ?  Now this question can be for any product which is out for sell. And as a technician I always get into product technical features, but at the same time as a pre-sales guy, it also makes me think, surely all competitive products have same features, so definitely answer to this is not in the technicalities.  If you step back and think, we are also a customer in our daily life and buy lot of things, what is that process we go through? When we buy, how can your customer decide if this is a right fit for you or not, why we select A over B? Is it price? is it service? Is it a brand? Is it about features? Is it about brand loyalty?  When it is a technical product, I am sure it cannot start with the technicalities of the product or selecting product itself, 100% not, I feel decision is always business strategy first and ...

Zero to Hero - A real life RCA of exact issue in Sitecore Managed Cloud environment

Hello All, The purpose of today's post is to share a real life burning and escalated scenario which was new to me and how did I approach it and how big the escalations were and what was the outcome Sitecore's goodwill was at stack not because Sitecore is not capable of handling it but just because our environment was Sitecore Managed Cloud, and any issue that comes if its infra, back end code, front end code will be first pointed as Sitecore issue and that is where our consultancy and experience will play a role to prove that it is not Sitecore issue.  Issue we faced Out of the blue our site started giving "504 Gateway Time-out", and it was reported that almost everyone is getting this error, but when we used to browse the site, everything looked good and never 504. 504 Gateway Time-out error tells that, That the request went to Content Delivery servers of Sitecore from gateway, but gateway did not get response in time from those CDs and hence it gave time out error. ...

Sitecore - How to show a new marketing promotional page on the same URL as existing home page

Hi Team, Today i will share one of the solution that we did for one of our customer, I am sure you will or you already might have came across such requirements and found your self in multiple option/solutions and trying to find best suited one for your customer, here is the story and solutions we thought of and finally selecting one out of it which was the best in all scenarios Also the solution was required in time sensitive deadline before their social marketing campaign begins so we had to come up with the solution and implement and go live before it. Customer Requirement They were doing a brand refresh, so whole site supposed to be revamped, With new user interface and UX, but that is a longer route, by the time we create that fully new site for them, they wanted to have a teaser home page, or a new home page to be shown just to give the visitor a feel of what is coming and they can market it using social campaigns. So their need was, Whenever users visit a website (www.blahblah.co...

Sitecore Stream - Platform DxP Evolution

Hi Team, I am absolutely Sitecore Stream enthusiast, and if you also keep following what is new in it and explore it features, This blog post is for you Since it was announced in symposium 2024 and probably the first platform DxP version package was released in FEB-2025 and we are now in Sep end and there have been significant roll outs and we are into 6th release of the platform DxP package. The purpose of this blog post is to summarize all improvements which came along with different releases for all of you and community, If you have not explored all of the packages. NOTE : Remember Stream is "AI capabilities throughout the composable stack, be it Content Hub, XMC, CDP, Personalized but this blog post is only for platform DxP package for on-prem XP/XM. If you see the image above, i have tried to show the package rollout on the timeline as an when they were released and watchout for next package rollout, For other useful features :)  Important improvements 1) Less configurations ...