Unable to connect with server on one computer

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Profile Bill G Special Project $75 donor
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Message 1715338 - Posted: 19 Aug 2015, 15:42:42 UTC

I have suddenly, after a failed update to Win 10, been unable to contact the server on SETI on that computer after a rollback to Win7. Computer http://setiathome.berkeley.edu/show_host_detail.php?hostid=5743750
I have reset the project (suggested by BOINC) to no avail. All that I get is that famous: Internet access OK, project servers may be down. I am getting WUs on my other computers just fine.
Any suggestions on what to try?

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Profile Jord
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Message 1715340 - Posted: 19 Aug 2015, 15:47:12 UTC - in response to Message 1715338.  

Start->Search, type cmd and hit Enter.
In the opening command line window, type ipconfig /flushdns and hit Enter.
That deletes the local DNS cache and forces the computer to look up the new IP addresses with the named addresses.
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Message 1715342 - Posted: 19 Aug 2015, 15:54:00 UTC - in response to Message 1715340.  

No luck I am afraid. Getting the same response in BOINC.

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Message 1715343 - Posted: 19 Aug 2015, 15:55:37 UTC

Check your firewall is set to allow BOINC to communicate to the outside world.
Bob Smith
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Message 1715347 - Posted: 19 Aug 2015, 16:00:08 UTC - in response to Message 1715343.  

Not the firewall this time.

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Message 1715350 - Posted: 19 Aug 2015, 16:08:00 UTC - in response to Message 1715338.  

Check that you've never set any manual IP addresses via a hosts file.

It's always worth typing 'ipconfig /displaydns' before flush, just to see if there's anything cached and worth flushing.
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Message 1715353 - Posted: 19 Aug 2015, 16:14:03 UTC - in response to Message 1715350.  
Last modified: 19 Aug 2015, 16:14:34 UTC

Since that gives quite a bit of output that cannot be scrolled back through in the command line, best do it like ipconfig /displaydns > c:\temp\dns.txt

That outputs the command to a text file called dns.txt in the c:\temp directory. Might be useful to check if c:\temp exists and if not, to make it first.

Mine is 564KB big.
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Message 1715356 - Posted: 19 Aug 2015, 16:26:18 UTC - in response to Message 1715353.  

Since that gives quite a bit of output that cannot be scrolled back through in the command line, best do it like ipconfig /displaydns > c:\temp\dns.txt

That outputs the command to a text file called dns.txt in the c:\temp directory. Might be useful to check if c:\temp exists and if not, to make it first.

Mine is 564KB big.

It depends if the machine with problems is a daily driver or a pure cruncher. On this machine, apart from a couple of internal addresses for machines on my local network, there were only two entries:

C:\Users\Richard Haselgrove>ipconfig /displaydns

Windows IP Configuration

    wpad
    ----------------------------------------
    Name does not exist.


    vortex-win.data.microsoft.com
    ----------------------------------------
    Record Name . . . . . : vortex-win.data.microsoft.com
    Record Type . . . . . : 5
    Time To Live  . . . . : 50
    Data Length . . . . . : 8
    Section . . . . . . . : Answer
    CNAME Record  . . . . : vortex-win.data.metron.live.com.nsatc.net

That changed when I opened this browser, of course ;)
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Message 1715397 - Posted: 19 Aug 2015, 17:45:54 UTC

make sure you run ipconfig / flushdns with elevated privileges
I came down with a bad case of i don't give a crap
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Message 1715496 - Posted: 19 Aug 2015, 20:34:24 UTC - in response to Message 1715350.  
Last modified: 19 Aug 2015, 20:34:57 UTC

[quote]Check that you've never set any manual IP addresses via a hosts file.

quote]
That was it Richard. It would appear from the graph that my stats have been going down since the changes in IP address and not just started today...only just noticed today but hard to check how long it was going on as the log gets wiped out each reboot.

Thank you all for you suggestions. It was interesting to see almost 300 WUs download after I removed the IP address in the hosts file.

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Message 1715498 - Posted: 19 Aug 2015, 20:38:08 UTC - in response to Message 1715496.  
Last modified: 19 Aug 2015, 20:42:42 UTC

Glad to be of assistance. And a memo to all the advisors: flushdns has no effect if the bad IP assignment is hardwired rather than cached.

Edit - the download server IP addresses - the ones we've had most trouble with in the past - have a very short TTL if obtained via DNS, less than 300 (seconds). They've usually disappeared from the cache already by the time you've remembered /displaydns.

If you see them in the cache, and especially if they have a TTL in four or five figures, that's usually a clue that they're coming from the hosts file and aren't "live" from a DNS server.
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Message 1715504 - Posted: 19 Aug 2015, 20:48:02 UTC - in response to Message 1715498.  

And did I say almost 300 WUs downloaded....well there were about 550 that downloaded but a lot of them are just ghosts I am afraid and will not be running on this computer.

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Message boards : Number crunching : Unable to connect with server on one computer


 
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