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  1. #1
    New Lounger
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    sudden loss of permissions

    Help save my marriage--I am so crazy about this problem, that I think my spouse will leave me.

    Sudden loss of ability to access laptop and vice versa from two peer-to-peer networks. Literally unplugged it from one at 6 pm, working fine, and plugged it in 20 minutes later to the other and had no access, which had been fine 12 hours before. Back in to work the next morning, could not access laptop on the same system as the night berore. Both home and work desktops access other computers on their respective networks with no difficulty. Both networks are peer to peer workgroups and I am the administrator. No programs or updates were installed in my 20 minute commute--or in the 24 hours preceeding on any of the three computers. Just incase, uninstalled the last 3 microsoft updates.

    I have restored system (5 times!) to a set point before the problem, removed all networking from the lap top, including once removing all the hardware in device manager. Re run network wizard maybe 15 times on the home and laptops, with both workgroup name same and different (was different and worked well for months). rebooted all of them scores of times.

    When browsing, both desktops see the laptop in the specific workgroup (now the same at home), but when clicked, it says I don't have permission to access it--and vice versa, the laptop says I don't have permission to to access the "home" network and does not see any of the computers in the network. So the problem is not hardware, it is clearly some miscellaneous setting that managed to change itself and is NOT in system restore, nor fixed with network removal and reinstallation. File sharing has be tested both with and without simple file sharing. I have gone through all the network settings with a fine toothed comb and they are the same for the laptop and the home computer.

    Equipment: two dell desktops, one with xp pro, one with xp home. One laptop with xp pro (laptop has both nic and wireless--have disabled the wireless for troubleshooting). Hve been taking the laptop between work and home for (with current configuration) at least a month. No problems whatsoever, two different peer to peer workgroups, home and work, but no problem with either in file and printer sharing/access--I have routinely been keeping my outlook file on the laptop and running it from either desktop--mapped the documents file even with no problem for months. Had a daily copy of all my files from desktop to laptop over work peer network every 2 hours for at least the last 6 weeks.

    PJ

  2. #2
    Plutonium Lounger
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    Re: sudden loss of permissions

    Do you log in to all of these PCs with the same username and password?
    Have you changed any passwords lately?
    What operating systems are you running on each PC?

    StuartR

  3. #3
    New Lounger
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    Re: sudden loss of permissions

    yes to all--but there are two differentworkgroups--which caused no problems for several months. two xp pro one xp home.

    I have fixed the problem using a hint from another posting in the forum--by installing a new protocol (that was definitely NOT installed before) as NWlink netbios--and it had to go on all three machines. So all works again, but I am still confounded as to WHY. I literally changed nothing but data files on the three computers. Unplugged the laptop, communicating fine, at work at 6 pm, plugged it in 15 minutes later at home, and it would not communicate, nor the next morning at work.

  4. #4
    Plutonium Lounger
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    Re: sudden loss of permissions

    If adding NETBeui fixed the problem then this suggests that something is wrong with your IP setup.

    Do you use a DHCP server at home or at work (or both)? (I wonder if a DHCP lease expired...)

    Do you want more help to try and fix the underlying problem or do you just want to forget it and get on with something that matters to you?

    StuartR

  5. #5
    New Lounger
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    Re: sudden loss of permissions

    I don't know, where do I look? I don't think we have a DHCP server in either case. In the properties for TCP/IP, advanced, it says that DHCP is enabled. How can I find out?

    I would like to understand what happened if it doesn't eat up too much time. After all, the initial problem probably ate up 20 hours of time, inclluding the inefficiencies of having to transfer files by CD.

  6. #6
    Plutonium Lounger
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    Re: sudden loss of permissions

    Some things to try
    <UL><LI>Open a command window on each computer, type <font color=blue>IPCONFIG</font color=blue> and note the IP address
    <LI>In the command window on each computer type <font color=blue>PING x.y.z.a</font color=blue> (where x.y.z.a is the address of another computer)[/list]This will tell us if there is any TCP/IP connectivity

    StuartR

  7. #7
    New Lounger
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    Re: sudden loss of permissions

    ping did not work either way. desk to lap, request timed out (4x); lap to desk, failed error code 65 (4x)

  8. #8
    Plutonium Lounger
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    Re: sudden loss of permissions

    What were the IP Addresses of each computer?
    Just to make sure that the IP stack is working can you try <font color=blue>PING 127.0.0.1</font color=blue> on each computer

    StuartR

  9. #9
    New Lounger
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    Re: sudden loss of permissions

    ping of 127.0.0.1 was fine on both computers:
    192.168.1.32 and 192.168.1.25 (I think the ip addresses are assigned dynamicallly by our firewall to the T1 line here at work. At home, I think my linksys router does that.)

  10. #10
    Plutonium Lounger
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    Re: sudden loss of permissions

    This is quite surprising.

    If both computers have addresses starting 192.168.1 then these have almost certainly been assigned by a DHCP server, you are very probably correct about where those DHCP servers are located.

    Just to make sure that both computers are talking on the wire can you try the commands
    IPCONFIG / RELEASE
    IPCONFIG /RENEW

    This will cause each computer to get a new address from the DHCP server.
    Then check the IP addresses again (IPCONFIG)
    And then try PING again to see if the computers can now see each other.

    Do you have a software firewall installed on any of the computers (ZoneAlarm, OutPost or the Built In Windows XP?
    To check for the built in XP firewall Settings > Network > Open your LAN connection > Properties > Advanced

    StuartR

  11. #11
    New Lounger
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    Re: sudden loss of permissions

    did the release/renew. both released and both renewed, but were given the same ip address. ping a to b and vice versa did not work. Neither has a firewall on, I use zone alarm but only on the road.

    I am about to head home, with the laptop, I will try all these diagnostics on that system, with the link sys router.

  12. #12
    New Lounger
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    Re: sudden loss of permissions

    at home, all is the same as work. dynamic ip (192.168.0.3 and .4), that will not ping a-b, b-a, and the 127.0.0.1 does fine. I forgot to check at work if my desktop can ping any other network computer--I cann do that tomorrow. I'm guessing it will do so, as I had no problems last week accessing others files, when the laptop and desktop would not communicate. It is clearly some obscure setting on the laptop.

  13. #13
    Plutonium Lounger
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    Re: sudden loss of permissions

    It is starting to sound as though you have a faulty Network card, or cable, on your laptop. Except that you said NETBeui was working between all your computers.

    <img src=/S/hmmn.gif border=0 alt=hmmn width=15 height=15> I will continue to think about this, but nothing obvious springs to mind. It wouldn't do any harm to run a Virus Scan, and a check for spyware and malware whilst I think about it.

    SturatR

  14. #14
    New Lounger
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    Re: sudden loss of permissions

    virus--have real time corporate Norton anti virus updated daily on all computers and I ran spybot and ad aware on all when the problem occured, have only a few cookie trackers, all were removed

    re cable, not a possibility, as problem is at work (cable 1) at home wired (cable 2) and at home with wireless access. And since it occurs both on wireless and wired access for laptop, not likely to be a card problem as the two adapers are physically different. And problem occurs if laptop connections are bridged (someday please explain this to me) or if I remove the bridge and just use the regular LAN connection.

    Thanks for thinking about it. Its one of those crazy-making problems that keep people up at night. But since I can work cross machine at this point, I am not desparate. Just curious.

  15. #15
    Plutonium Lounger
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    Re: sudden loss of permissions

    Another possiblility is that the routing is set up wrong, for example that you are sending packets over the wireless link instead of the LAN.

    Can you issue the command <font color=blue>TRACERT x.y.z.a</font color=blue> from each computer (where x.y.z.a is the address of the other computer). This will tell us which route packets are trying to take.

    StuartR

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