Emond[106]: Host at 10.0.0.100 will be blocked for at least 15 minutes

Question

After a clean install of Lion Server 10.7.3 (1.3.1) and making the basic configuration (users etc.) i enabed the Time Machine service with a WDC MyBook Studio Edition II as the destination. Setting up the first client using this TS Service works fine, but the second client reports the error "Time Machine cannot complete the backup, backup disk not available" after starting the initial backup.
Only indication on the server side that it fails is the message "Feb 25 13:22:48 paris emond[106]: Host at 10.0.0.100 will be blocked for at least 15 minutes" in the system log as an isolated message;
Feb 25 13:21:50 paris org.clamav.clamd[74]: SelfCheck: Database status OK.
Feb 25 13:22:48 paris emond[106]: Host at 10.0.0.100 will be blocked for at least 15 minutes
Feb 25 13:31:50 paris org.clamav.clamd[74]: SelfCheck: Database status OK.
I tried the following to solve it;
Flush the firewall
sudo /sbin/ipfw -f flush
Change the default firewall address from 127.0.0.0 to the ip-addres of the ethernet interface of the Lion Server
vi /etc/af.plist
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
        <key>blacklist_file</key>
        <string>/var/db/af/blacklist</string>
        <key>default_set</key>
        <string>17</string>
        <key>default_timeout</key>
        <string>15</string>
        <key>firewall_address</key>
        <string>10.20.0.100</string>
        <key>log_facility</key>
        <string>SBS_Security</string>
        <key>log_level</key>
        <string>5</string>
        <key>start_behavior</key>
        <string>enable</string>
        <key>state_file</key>
        <string>/var/run/af_state</string>
        <key>sweep_interval</key>
        <string>20</string>
        <key>whitelist_file</key>
        <string>/var/db/af/whitelist</string>
</dict>
</plist>
serveradmin stop ipfilter
serveradmin start ipfilter
Add the subnet 10.x.x.x to the firewall whitelist
/usr/libexec/afctl afctl -w 10.0.0.0/8
Till now not, no joy .
The only indication i could find till now is the "emond[106]: Host at 10.0.0.100 will be blocked for at least 15 minutes" message in the
system log. Anyone any suggestions , ideas , hints how to analyze this issue further or better to resolve this ?

Answer 1

I had a similar problem. I fixed it using a few steps. I think the important steps were performed on the Time Machine client although I also rebooted the Time Machine server once and cycled the Time Machine service on and off a few times. I also turned on and off the external drives connected to the Time Machine server.
Now to the steps that I think actually fixed the problem. They were performed on the Time Machine client.
1) Under Time Machine in System Preferences, turn it off and remove the remote backup destination.
2) Under Keychain Access in Utilities within Applications, look for entries under login and System related to your Time Machine server machine.
3) From the client, I connected to the Time Machine server both through Finder and through Time Machine preferences under System Preferences. Instead of just entering the password, I changed the password a few times.
4) I also deleted the Keychain entries between some of these password changes.
5) Then I went back to Time Machine one last time and set up the remote volume on the Time Machine server and turned it on.