I realize this is a very common problem, I have seen hundreds of thread regarding this but I have been unable so far to fix my problem.

Boinc has been working fine for the last few months, now the manager says it's disconnected from the client.

I am using Linux mint, my kernel is Linux 2.6.35-28-generic (x86_64) and I have Boinc 6.10.58 installed.

The things I've tried so far are:

1. Reinstalling and tried to change my manager's preferences to default with the clear button. The clear button didn't really work as the settings remain exactly the same.

2. Accessing gui_rpc_auth.cfg and changing it to an easier password. Note I have found 4 such files. They were located in
etc/boinc-client
home/'username'
usr/bin
var/lib/boinc-client

I left all of the files empty guessing this would mean I could just press OK when asked to enter a password.

3. I opened firewall ports 80, 443, 31416 which boinc is supposed to need to operate. Let me mention that my firewall was disabled. I had to enable it first before opening the ports. Since the firewall was disabled I doubt it would make any difference but still.

For starters I am asking for help.
But also I would like to suggest that since this is such a common problem you should put a Wiki entry on it with most common reasons and solutions.

Boinc has been working fine for the last few months, now the manager says it's disconnected from the client.

So instead of trying to fix BOINC, why not try to figure out what changed on your system that made BOINC break? That's where I would start.

A program has worked for ages, something changes on the system, the program now doesn't work. Do you really need to go fix the program, or do you need to figure out why the change to your system broke the program?

1. Reinstalling and tried to change my manager's preferences to default with the clear button. The clear button didn't really work as the settings remain exactly the same.

These are BOINC preferences, through which you tell it to do work like such and so. It has nothing to do with operating BOINC itself. So it's useless trying to reset these preferences.

2. Accessing gui_rpc_auth.cfg and changing it to an easier password. Note I have found 4 such files. They were located in
etc/boinc-client
home/'username'
usr/bin
var/lib/boinc-client

Depends on how you installed the latest BOINC, or probably where from. Berkeley installer or package manager?

3. I opened firewall ports 80, 443, 31416 which boinc is supposed to need to operate. Let me mention that my firewall was disabled. I had to enable it first before opening the ports. Since the firewall was disabled I doubt it would make any difference but still.

Here's a thing: You don't need to open ports 80 and 443 when your browser can access the internet on http and https addresses without fuss.
Here's another thing: If it worked before without you needing to add anything to a firewall or you enabling a firewall, then that is not what is blocking it at this time either! Just reason within reason.

But also I would like to suggest that since this is such a common problem you should put a Wiki entry on it with most common reasons and solutions.

The Wiki is open to all. Anyone, even you, who has registered an account there, could go post in there. That's different with my BOINC FAQs, those are closed off for editing to a select few, but then we're 3rd party help.

So, my help to you is this: try to figure out what changed on your system. Which changes were made to the system lately and which one is it that breaks your working system. Yes, that means that you will have to go back to before the last batch of changes that broke your system and then add those changes one by one, until you find the culprit. There's no easy way around that, that I see.

---

There is that one, that I constantly forget. ;-)

Here is the output

ps aux | grep boinc
1000      1919  2.1  0.7 283328 24236 ?        Rl   Jun20  12:40 /usr/bin/boincmgr
1000      5771  0.0  0.0   8956   848 pts/0    S+   00:47   0:00 grep --colour=auto boinc

From what I gather boinc isn't running. Shouldn't the boinc client run automatically when starting the boinc manager?

sudo /etc/init.d/boinc-client start
 * Starting BOINC core client: boinc                                     [ OK ] 
 * Setting up scheduling for BOINC core client and children:             [ OK ] 

ps aux | grep boinc
boinc     2464  0.8  0.3  96444 12336 ?        SN   16:32   0:00 /usr/bin/boinc --check_all_logins --redirectio --dir /var/lib/boinc-client
boinc     2540 50.3  0.7  34276 24196 ?        RNl  16:32   0:23 ../../projects/qah.uni-muenster.de/qasinoAlpha_5.01_x86_64-pc-linux-gnu
boinc     2544 52.3  2.8 101140 95572 ?        RNl  16:32   0:24 ../../projects/einstein.phys.uwm.edu/einstein_S6Bucket_1.01_i686-pc-linux-gnu__SSE2 --Freq=254.413682292 --FreqBand=0.05 --dFreq=1.61431023092e-06 --f1dot=-2.64248266531e-09 --f1dotBand=2.90673093185e-09 --df1dot=5.78907096294e-11 --skyGridFile=skygrid_GC_Dc0.5_m0.3_0260Hz_S6Bucket.dat --numSkyPartitions=946 --partitionIndex=758 --gammaRefine=230 --ephemE=earth --ephemS=sun --nCand1=3000 -o GCT.out --gridType=3 --printCand1 --semiCohToplist --segmentList=segments --outputFX -d1 --Dterms=8 --DataFiles1=h1_0254.30_S6GC1;l1_0254.30_S6GC1;h1_0254.35_S6GC1;l1_0254.35_S6GC1;h1_0254.40_S6GC1;l1_0254.40_S6GC1;h1_0254.45_S6GC1;l1_0254.45_S6GC1;h1_0254.50_S6GC1;l1_0254.50_S6GC1 --WUfpops=6.47816e+13
1000      2566  0.0  0.0   8952   848 pts/0    S+   16:32   0:00 grep --colour=auto boinc

It now seems to be running

Also the manager automatically connected back to the client I manually opened.

I'll try putting the /etc/init.d/boinc-client start command in my startup and see if it all works.