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1. Before going any further check that you have latest Sun Java(TM) plugin (http://java.com) and JavaScript is enabled in browser.2. Console is not responding sometimes:
2.1. Connection problems:
2.1.1. Connection error messages may indicate that VNC server for this VM is down - possible reason VN is stopped or being restarted. Refresh page to check VM status and reconnect to Remote Display.
2.1.2. Remote IP address serving VM Remote Display may be unreachable from client machine. Please use 'ping' or any other suitable tool to check that VNC server is unreachable. VNC IP and port is provided in page description. If you find it so, use VM's General Settings/Remote Display controls to choose other IP address for VNC server for the VM, or ask your network administrator to resolve this problem.
2.1.3. VNC applet is not shown on screen or is 0x0 px size: VNC server is a separate application that can fail to start (in case two VMs share one port due to manual settings) or exit with error, in such cases, please, check VM's General Settings/Remote Display settings and restart VM.
2.2. Client problems:
2.2.1. VNC client is sometimes shown as white rectangle and not responding to user actions: please, check Java Plug-in Console (browser specific) for errors. Most common problem is 'out of memory' error when viewing large remote screens. To address this problem provide more memory for Java applets. Follow instructions on http://java.sun.com/j2se/1.5.0/docs/guide/deployment/deployment-guide/jcp.html section "Java Applet Runtime Settings" and set '-Xmx128M' in 'Java Runtime Parameters' allowing plugin to use up to 128 Mb.
3. Console usability issues:
3.1. Tab key not working, VNC applet isn't resized to fit window - see section 0.
3.2. Jumpy and offset mouse:
- check that you're using up-to-date version of Parallels Server
- use 'grabbed mouse' mode - to toggle it click on applet or use 'Ctrl-Alt' keystroke
3.3. Can't enter 'Ctrl-Alt-Del', 'Alt-Tab' and such - use 'Toggle Sticky Keys' and enter keystrokes sequentially like: press 'Alt' > release > press 'Ctrl' > release > press 'Del' > release = 'Ctrl-Alt-Del'.
4. You've updated PVA and expected fixes for VNC applet functionality are not available - please, use instructions from http://java.sun.com/j2se/1.5.0/docs/guide/deployment/deployment-guide/jcp.html to clean Java applets cache or open Java Console and type 'xgc' and reload page with VNC applet.
5. After reading 0-3 you have still problems using VNC applet - you may consider using standalone VNC viewer available at http://www.tightvnc.com/ .
6. VM's Remote Display (VNC) server is not available both in VNC applet and standalone viewer.
6.1. Check that Remote Display is enabled in VM's General Settings and VM is running.
6.2. Consider using alternative solutions:
- SSH or VNC server running in guest Linux or Unix - like OS bound to VM's IP address
- Terminal Server or VNC server running in guest Windows OS bound to VM's IP address
6.3. The only way to connect to VM that has neither VNC server running on host nor remote access services (see 5.2) running in guest OS is to use Parallels Server Management Console GUI.