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Mac OS X web browsers, email, and other Internet applications work slowly

APPLIES TO:
  • Parallels Desktop

ISSUE

When Parallels Desktop version 6 or 7 is installed, the performance of Mac OS X applications that use the Internet run slow.

CAUSE

The applications may be trying to establish an Internet connection through Internet Protocol version 6 (IPv6).

RESOLUTION

To solve the problem, try the following:

For Parallels Desktop 7

1. Quit Parallels Desktop.
2. On your Mac, navigate to /Library/Preferences/Parallels/ and open the file network.desktop.xml.
3. In the file, change <IPv6Enabled> string from 1 to 0 (see below)

<?xml version="1.0" encoding="UTF-8"?>
<ParallelsNetworkConfig schemaVersion="1.0" dyn_lists="VirtualNetworks 1 VZNetworkConfig 0">
<SystemFlags></SystemFlags>
<IPv6Enabled>1</IPv6Enabled>
<VirtualNetworks id="0" dyn_lists="VirtualNetwork 2">
<VirtualNetwork id="0" dyn_lists="VZVirtualNetwork 0"> 


To

<?xml version="1.0" encoding="UTF-8"?>
<ParallelsNetworkConfig schemaVersion="1.0" dyn_lists="VirtualNetworks 1 VZNetworkConfig 0">
<SystemFlags></SystemFlags>
<IPv6Enabled>0</IPv6Enabled>
<VirtualNetworks id="0" dyn_lists="VirtualNetwork 2">
<VirtualNetwork id="0" dyn_lists="VZVirtualNetwork 0"> 


For Parallels Desktop 6:

1. Quit Parallels Desktop.
2. On your Mac, navigate to /Library/Preferences/Parallels/ and open the file network.desktop.xml.
3. In the file, change <HostIP6Address> string for both Shared and Host Only network type from from the current value to ::1 (see below)

<HostOnlyNetwork dyn_lists="">
<HostIPAddress>10.37.129.2</HostIPAddress>
<DhcpIPAddress>10.37.129.1</DhcpIPAddress>
<IPNetMask>255.255.255.0</IPNetMask>
<HostIP6Address>FDB2:2C26:F4E4:1:0:0:0:1</HostIP6Address>
<DhcpIP6Address>FDB2:2C26:F4E4:1:0:0:0:0</DhcpIP6Address>
<IP6NetMask>FFFF:FFFF:FFFF:FFFF:0:0:0:0</IP6NetMask>


To

<HostOnlyNetwork dyn_lists="">
<HostIPAddress>10.37.129.2</HostIPAddress>
<DhcpIPAddress>10.37.129.1</DhcpIPAddress>
<IPNetMask>255.255.255.0</IPNetMask>
<HostIP6Address>::1</HostIP6Address>
<DhcpIP6Address>FDB2:2C26:F4E4:1:0:0:0:0</DhcpIP6Address>
<IP6NetMask>FFFF:FFFF:FFFF:FFFF:0:0:0:0</IP6NetMask>


And

<HostOnlyNetwork dyn_lists="">
<HostIPAddress>10.211.55.2</HostIPAddress>
<DhcpIPAddress>10.211.55.1</DhcpIPAddress>
<IPNetMask>255.255.255.0</IPNetMask>
<HostIP6Address>FDB2:2C26:F4E4:0:0:0:0:1</HostIP6Address>
<DhcpIP6Address>FDB2:2C26:F4E4:0:0:0:0:0</DhcpIP6Address>
<IP6NetMask>FFFF:FFFF:FFFF:FFFF:0:0:0:0</IP6NetMask>


To

<HostOnlyNetwork dyn_lists="">
<HostIPAddress>10.211.55.2</HostIPAddress>
<DhcpIPAddress>10.211.55.1</DhcpIPAddress>
<IPNetMask>255.255.255.0</IPNetMask>
<HostIP6Address>::1</HostIP6Address>
<DhcpIP6Address>FDB2:2C26:F4E4:0:0:0:0:0</DhcpIP6Address>
<IP6NetMask>FFFF:FFFF:FFFF:FFFF:0:0:0:0</IP6NetMask>


For both Parallels Desktop 7 and Parallels Desktop 6:
  1. Open Terminal (you can find it using Spotlight).



5. In Terminal type:

"sudo launchctl stop com.parallels.desktop.launchdaemon"

6. Press Return and wait about 10 seconds.

7. In Terminal, type:

sudo launchctl start com.parallels.desktop.launchdaemon

8. Press Return.

9. If asked, type your administrator password and press Return. While typing your password, the text won't be shown. This is normal.




10. Start Parallels Desktop.




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