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Hi, I'm having this issue with my exchange server 2016. Does anyone has ever experienced the same issue or know the resolution?
![277228-microsoftteams-image-5.png][1]
[1]: /api/attachments/277228-microsoftteams-image-5.png?platform=QnA
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(284.8, 17%, 37%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EYS%3C/text%3E%3C/svg%3E)
Hi @Ardan Zaki and @Yandri Eko ,
>Server error in '/ecp' application. Could not load type 'System.Web.Request.Verify.ReqVerify'
I did a quick search about this error but didn't see anything that can be applied. Could you try to elaborate the things below so that we can see if more clues can be found?
Hi，
Just wondering how things are going on with this issue. Any update would be appreciated.
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(272, 15%, 36%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EYE%3C/text%3E%3C/svg%3E)
Hi, am with Ardan's team too.
Anyway we've already did this steps below, but problem persist;
https://learn.microsoft.com/en-us/exchange/troubleshoot/client-connectivity/owa-stops-working-after-update
Also from our team, theres no activity regarding with SU/CU update.
we checked from installed SU/CU update, and theres no history from new installation.
Is there anyway to solve this issue ?
*Appreciate all of the comments if theres any, kindly need your help. :)
Hi Team,
Thankyou for all ur comments, anyway this case has been solved after upgrading Exchange Server to CU 23.
Thankyou.
Great to know that the issue has been resolved and many thanks for the share!
Hi, we finally solved the issue with installing CU23
Thank you for all insights.
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(137.6, 98%, 23%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EAS%3C/text%3E%3C/svg%3E)
Check the solutions given below for more insight: http://msexchangeguru.com/2016/02/19/e2016-ecp-works-owa-fails/ http://msexchangeguru.com/2015/03/31/troubleshooting/ https://social.technet.microsoft.com/Forums/office/en-US/83df7a34-fb32-4508-bd38-a451444babde/event-1310aspnet-40303190?forum=Exch2016Adm https://www.stellarinfo.com/blog/exchange-server-http-500-error-ecp/ There is a similar case you could refer to Error in ECP.
I have run those step and still got this error
This error looks different from the one shared in your original post. Which link did you refer to?