I build up a peer-to-peer network connecting my laptop and my desktop pc.
After shutting down both pcs' firewall, I was able to succesfully ping each
one from the other and both pcs can see each other in the network.
But when I try to copy any kind of files from one machine to the other, a
notation appears, saying that the LAN-Connection was cut off. After a few
seconds the connection is reestablished, but the file will not be copied,
because the cut-off-note appears again and again.
I checked the (crossed) cable, but it seems to work properly.
Any suggestions?
Thanks in advance.
Nikolai
Nikolai,
Is the problem relevant to one file, or to multiple files? On both computers?
Can you find any relevant error messages in Event Viewer (Control Panel -
Administrative Tools) on either computer?
Can you connect a third computer to either computer, and try and isolate the
problem to one computer?
Try another cross-over cable.
If you can identify the problem computer, try another network adapter. Make
sure you have the latest drivers for the adapter.
Consider an adware / spyware / virus infection causing problems. Check, and
protect, both computers.
How current is your virus protection? Try one or more of these free online
virus scans, which should complement your current protection:
<
http://www.bitdefender.com/scan/license.php>
<
http://www.pandasoftware.com/activescan>
<
http://www.ravantivirus.com/scan/>
<
http://security.symantec.com/ssc/home.asp>
<
http://housecall.trendmicro.com/housecall/start_corp.asp>
Now check for, and learn to defend against, additional problems - adware,
crapware, spyware.
Start by downloading each of the following additional free tools:
AdAware <
http://www.lavasoftusa.com/>
CWShredder <
http://www.majorgeeks.com/download4086.html>
HijackThis <
http://www.majorgeeks.com/download.php?det=3155>
LSP-Fix and WinsockXPFix <
http://www.cexx.org/lspfix.htm>
Spybot S&D <
http://www.safer-networking.org/index.php?page=download>
Stinger <
http://us.mcafee.com/virusInfo/default.asp?id=stinger>
Create a separate folder for HijackThis, such as C:\HijackThis - copy the
downloaded file there. AdAware, CWShredder, and Spybot S&D have install
routines - run them. The other downloaded programs can be copied into, and run
from, any convenient folder.
First, run Stinger. Have it remove any problems found.
Next, close all Internet Explorer and Outlook windows, and run CWShredder. Have
it fix all problems found.
Next, run AdAware. First update it ("Check for updates now"), configure for
full scan (<
http://forums.spywareinfo.com/index.php?showtopic=11150>), then
scan. When scanning finishes, remove all Critical Objects found.
Next, run Spybot S&D. First update it ("Search for updates"), then run a scan
("Check for problems"). Trust Spybot, and delete everything ("Fix Problems")
that is displayed in Red.
Then, run HijackThis ("Scan"). Do NOT make any changes immediately. Save the
HJT Log.
<
http://forums.spywareinfo.com/index.php?showtopic=227>
<
http://forums.spywareinfo.com/index.php?showtopic=11150>
Finally, have your HJT log interpreted by experts at one or more of the
following security forums (and please post a link to your forum posts, here):
Aumha: <
http://forum.aumha.org/index.php>
Net-Integration: <
http://forums.net-integration.net/>
Spyware Info: <
http://forums.spywareinfo.com/>
Spyware Warrior: <
http://spywarewarrior.com/index.php>
Tom Coyote: <
http://forums.tomcoyote.org/>
If removal of any spyware affects your ability to access the internet (some
spyware builds itself into the network software, and its removal may damage your
network), run LSP-Fix and / or WinsockXPFIx.
Finally, improve your chances for the future.
Harden your browser. There are various websites which will check for
vulnerabilities, here are three which I use.
http://www.jasons-toolbox.com/BrowserSecurity/
http://bcheck.scanit.be/bcheck/
https://testzone.secunia.com/browser_checker/
Block Internet Explorer ActiveX scripting from hostile websites (Restricted
Zone).
<
https://netfiles.uiuc.edu/ehowes/www/main.htm> (IE-SpyAd)
Block known dangerous scripts from installing.
<
http://www.javacoolsoftware.com/spywareblaster.html>
Block known spyware from installing.
<
http://www.javacoolsoftware.com/spywareguard.html>
Make sure that the spyware detection / protection products that you use are
reliable:
http://www.spywarewarrior.com/rogue_anti-spyware.htm
Harden your operating system. Check at least monthly for security updates.
http://windowsupdate.microsoft.com/
Block possibly dangerous websites with a Hosts file. Three Hosts file sources I
use:
http://www.accs-net.com/hosts/get_hosts.html
http://www.mvps.org/winhelp2002/hosts.htm
(The third is included, and updated, with Spybot (see above)).
Maintain your Hosts file (merge / eliminate duplicate entries) with:
eDexter <
http://www.accs-net.com/hosts/get_hosts.html>
Hostess <
http://accs-net.com/hostess/>
Secure your operating system, and applications. Don't use, or leave activated,
any accounts with names or passwords with trivial (guessable) values. Don't use
an account with administrative authority, except when you're intentionally doing
administrative tasks.
Use common sense. Yours. Don't install software based upon advice from unknown
sources. Don't install free software, without researching it carefully. Don't
open email unless you know who it's from, and how and why it was sent.
Educate yourself. Know what the risks are. Stay informed. Read Usenet, and
various web pages that discuss security problems. Check the logs from the
security products that you use regularly, look for things that don't belong, and
take action when necessary.
How did I get infected in the first place?
http://forums.net-integration.net/index.php?showtopic=3051
Essential tips for infection prevention
http://forums.spywareinfo.com/index.php?showtopic=24339
Cheers,
Chuck
Paranoia comes from experience - and is not necessarily a bad thing.
