One of my machines can no longer connect to the client. I can use all other internet functions and my other machines are online with BOINC, but I keep getting the error,
"BOINC Manager is not able to connect to a BOINC client. Would you like to connect again?"

I have disabled my firewall and a computer attached to the same router is working properly. It is an XP system and a P4 2.0 that hasn't given me many problems throughout its lifespan. Un-installing and then re-installing BOINC has not helped either. I am at a loss. Any Ideas?

I have the same problem.....I know how to make it work, but it is kinda crude.

once the bonc manager is running and has the cannot connect to client would you like to try again message, open the boinc directory on you hard drive and run boinc.exe, then click yes on the message in bionic manager......

I have no idea why it does this it just started last night, have run for hundreds of hours withut problem, if you receive a better solution of figure it out for yourself could you please drop me an email xgstr@hotmail.com because i must admit i rarely check this forum....

thanx
G

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Here are some things to try and resolve this problem...

Do you have BOINC starting at boot? If so delete it from windows startup and reboot, that works for some people...

OK, the disconnected issue means that the BOINC manager is not able to talk to the BOINC daemon. Whether or not you are uploading/downloading/crunching at this point must be determined with the task list (I do not remember how to bring this up for 95/98/me).
The usual reason for this problem is that the BOINC manager is starting and trying to talk before the BOINC daemon is ready to listen. The usual fix is to wait a minute or two and see if connecting to "" or "localhost" or "127.0.0.1" works.
If the above fails, then there is a possibility that the BOINC daemon is not starting. If that is the case, then staring it manually may help. If it is installed as a service, run "net start BOINC" from a command line. If it is installed as single or multi user, cd to the install directory, and run BOINC.exe. If it is now running, you are the victim of a bug that has hopefully been fixed in 5.1.
If it is still not working, you have a problem with one of the XML files, and you will probably have to delete the directory and start over. (I have seen this problem much less with 5.1).
You might also go to the BOINC folder and look for this file "gui rpc auth.cfg" open with word pad and change the password to one you like make sure you enter a return at the end and then save and reboot computer then try the local host entry in select computer popup..... Check your firewall.
When all screens in BOINC Manager are blank, check that BOINC.exe is running. In Windows NT/2k/XP, right click on the Windows task bar and choose Task Manager. Go to the processes tab and check if BOINC.exe is running. Check how many versions of Boincmgr.exe there are running.

If more than 2 of the latter, close them all down and restart one.
If BOINC.exe isn't running, please try a reboot of the computer first.

Close down BOINC as far as it is running.
Navigate to your BOINC directory.
Find the file called gui_rpc_auth.cfg and delete it.
Then restart BOINC.
That will most probably fix it.

(When you revert back to 4.45 you need to delete this file as well!)

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BOINC Wiki

Turning on the manager and then running BOINC.exe worked perfectly! Thanks for the help!