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![](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(16, 69%, 11%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EAK%3C/text%3E%3C/svg%3E)
I am working with webapi .It works fine when I call it from postman
but it give me error when I login from my Xamarin app using vs 2019
Error screen shot is attached 
A Microsoft framework for building cross-platform mobile apps using .NET and C# with native performance and user interfaces.
![](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(128, 8%, 22%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EA%3C/text%3E%3C/svg%3E)
Firstly, please check your date time of the device, if it is correct.
Then, if the date time is correct, you can reboot your device, if you used android emulator, you need to Cold Boot(Virtual Device Manager -> Actions dropdown -> Cold Boot Now)
If it is still not working, please share a test API and related code so that I can reproduce this issue.
Thanks your quick response
my device date time and emulator is properly working
Basically problem was due to ssl certificate which was not issue on my webapi
after upload ssl certificate problem resolved
Again thanks to you for guiding me .