We had to reboot our applications server after some updates were applied. After rebooting, it's not possible for any end user to login to ELN. They get this error message:Sorry, an error occurred while opening a client connection: while setting up connect

We had to reboot our applications server after some updates were applied. After rebooting, it's not possible for any end user to login to ELN. They get this error message:

Sorry, an error occurred while opening a client connection: while setting up connection to central database: Client found response type of 'text/html; charset=utf-8', but expected 'text/xml'.

There's a chance the ASP.NET version for the ELN Services switched back to version 1.x after the updates/reboot.

Try the following:

1- Login to the middle tier as an administrator.
2- Go to Administrative Tools->Internet Information Services (IIS).
3- Expand Local Computer->Web Sites->Default Web Site->ENService.
4- Right click ENService and select Properties.
5- Go to the ASP.NET tab and set ASP.NET version back to 2.0.50727.
6- Do an IISRESET and ask end users to try to login again.