You may receive "HTTP Error 503: Service Unavailable" error when you are using Black Berry browser. If your BlackBerry Mobile Data System (BlackBerry MDS) service is not enabled on your BlackBerry Enterprise Server or for your BlackBerry device user account. Resolution 1 Enable MDS Service on you BES Server by completing the following steps: Go to Server Configuration tab. Expand Service Control & Customization. Click BlackBerry MDS Connection Service. Enable the BlackBerry Mobile Data Read more

ESX Stop Firewall and IpTables chkconfig firewall off > /dev/null 2>&1 chkconfig iptables off > /dev/null 2>&1 chkconfig --level 3 portmap on > /dev/null 2>&1 chkconfig --level 3 netfs on > /dev/null 2>&1 chkconfig --level 3 vmware on > /dev/null 2>&1 chkconfig --level 3 vmware-late on > /dev/null 2>&1 chkconfig --level 3 mgmt-vmware on > /dev/null 2>&1 service firewall restart > /dev/null 2>&1 service iptables restart Read more

You may see that error when you migrate virtual machine between two ESX servers with different hardware. Please right click on VM and choose "Edit Options", select "Options", select "CPUID mask" and change it to "Hide the NX flag from quest". It will give you more comparability between CPUs but will hurt performance. Read more