Single sign on is not working. The ssosvr.exe process is not running.

The Citrix Single Sign On provider is not listed in the Control Panel | Network Connections | Advanced | Advanced Settings | Provider Order tab

Logged in as an Administrator:

- Start Prgram Neighbourhood
- Select Tools | ICA Settings
- Uncheck Pass-Through Authentication and click OK
- Select Tools | ICA Settings
- Check Pass-Through Authentication
- Check Use local credentials to logon and click OK

Check the following registry keys:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\NetworkProvider\HwOrder
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\NetworkProvider\Order

The ProviderOrder value should list the PnSson value e.g.

"ProviderOrder"="CdmService,RDPNP,LanmanWorkstation,WebClient,PnSson"

An issue has been seen where this value appears multiple times, or where there is a double comma (e.g. CdmService,RDPNP,LanmanWorkstation,WebClient,,PnSson) that will cause Citrix Single Sign On to fail.

Restart the computer and check that the Citrix Single Sign On provider is listed in the Control Panel | Network Connections | Advanced | Advanced Settings | Provider Order tab, and that the ssonsvr.exe process is running.