Session Reliability Limit of 150 users per server

XenApp has a limitation of 150 sessions per server when session reliability is enabled.
This is applicable on XenApp 4.5 (32 and 64 Bit) and XenApp 5.0 (32 Bit)

This default maximum can be overridden with the following registry key

HKLM\Software\Citrix\XTEConfig

Add MaxThreads (REG_DWORD) with the increased value