Hi Shiva Did you upgrade your license server to 11.5 before installing the hotfix rollup? Cheers Russell Russell Robertson | Virtual Stream | Microsoft, Citrix and VMware advisers | From: thin-bounce@xxxxxxxxxxxxx [mailto:thin-bounce@xxxxxxxxxxxxx] On Behalf Of Shankar, Shiva Sent: 20 March 2009 09:09 To: thin@xxxxxxxxxxxxx Subject: [THIN] I applied is PSE400W2K3R06 Hello, I applied the patch on our citrix PS 4 server , the patch which I applied is PSE400W2K3R06 after restarting server I'm receiving error message "Metaframe Presentation Server cannot contact the license server IP address" Please advice Thanks & Regards, Shiva Shankar S