Unable to obtain a server assigned IP address

Discussion in 'ActiveSync' started by TweetyMalle, May 4, 2006.

  1. TweetyMalle

    TweetyMalle Guest

    dEvery time i connect my device to ActiveSync i get the message "Unable to
    obtain a server assigned IP adress. Try again later or enter an IP adress in
    the Network settings." How can i solve this problem please.
     
    TweetyMalle, May 4, 2006
    #1
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  2. Chris De Herrera, May 4, 2006
    #2
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  3. This is on the device that you see the message or on the PC? If the device,
    open the Control Panel | Connections | Network Cards applet and tap on the
    Remote-NDIS Host item. If Use server assigned IP address is selected,
    change to selecting Use specific IP address and set the address fields to:

    169.254.2.1
    255.255.255.0
    blank

    Paul T.
     
    Paul G. Tobey [eMVP], May 5, 2006
    #3
  4. TweetyMalle

    TweetyMalle Guest

    In the "Services" there is running a "DHPC" client
     
    TweetyMalle, May 6, 2006
    #4
  5. TweetyMalle

    TweetyMalle Guest

    I need the Internet ruglair. This IP 169.254.2.1 , can i use it to go on the
    Internet on a other router?
     
    TweetyMalle, May 6, 2006
    #5
  6. You lost me. The IP is just the IP of your local device. It neither
    enables nor prevents Internet access. The ActiveSync program running on the
    connected PC is responsible for forwarding the network traffic to Web
    servers, etc. That is, the router configuration of the *PC* determines how
    the Internet is accessed.

    Paul T.

     
    Paul G. Tobey [eMVP], May 8, 2006
    #6
  7. TweetyMalle

    Dan Guest

    I think you may have missed the point. Some ppc's have multiple nics, e.g.
    the usb for activesync, wifi, bluetooth etc.

    If one freezes the IP of the subnet, as you describe, then what happens when
    trying to access the (inter)net through a wifi router which is running a DHCP
    server? Is the ppc capable of different ip's for each of its interfaces? If
    that is so, then how come the NDIS seems to be generically associated with
    connections?

    Thanks in advance for your response.

    dan

     
    Dan, Oct 9, 2006
    #7
  8. If the WiFi router is still on the same subnet, it shouldn't care.
    Obviously, if you have a static IP set for your wireless device and then you
    change the subnet part of the router's IP address, then it's not going to
    work, but it doesn't care if its users got their IP addresses from it via
    DHCP or whether they are statically allocated.

    Yes, each adapter must have its own IP address and there is no need for them
    to have *any* relationship to each other. The WiFi adapter might be
    172.16.0.127, while the GPRS adapter might have 221.147.2.77 (or whatever;
    they're just random numbers, as far as you know). The only effect that one
    has on the other is that packets might be routed via one adapter or the
    other because of which network they are configured to be connected to or
    which interface is lower-cost (usually this equates to "faster").

    In any case, though, when communicating via ActiveSync to the Internet,
    routing is being done by the desktop PC on which ActiveSync is running.
    It's routing, really it's proxying, packets from the Pocket PC to whatever
    server it's trying to talk to.

    Paul T.

     
    Paul G. Tobey [eMVP], Oct 9, 2006
    #8
  9. TweetyMalle

    Dan Guest

    Thanks *very* much for the swift response. Well the wifi router won't be on
    the same subnet since most of the nat routers (including mine, a dlink)
    use192.168.xxx or 10.xxx for the hosts since these are "off net". Also, one
    has no control of the subnet when going to another location and using the
    routers there.

    For specificity, I recently got an MDA aka HTC Wizard.

    My confusion is that I don't know what interface I am assigning the static
    IP to. In the connections panel three adapters are listed: Remote-NDIS
    HOst, NE2000 Compatible Driver, and SDIO WLAN Wireless Adapter. To fess up,
    I don't know what Remote-NDIS Host means. However when looking in the
    Network adaptors menu under "wlan", this seems to be the interface that it is
    using, not the SDIO thingie.

    If ActiveSync routing is being sone via some kind of proxy (the AKU thing,
    whatever that is?), then why does the wlan interface matter?

    I guess I am not clear on what is being set to 169.xxxx or why setting it
    to this value makes the OS find a connection.

    I don't use or subscribe to GPRS so I haven't experimented with that
    interface.

    I don't know whether others have the same points of confusion, I suspect
    they may either know more, or less, or just want a recipe.

    Hope this helps focus the confusion (and hopefully remove some). It seems
    that random notes on this error message, and the 169.xxx fix are posted all
    over the net, but without explanation. Your posting was the only one I
    spotted that seemed to know what they were talking about (fundamentals
    wise)!!!

    Also, what does the DHCP flag in the registry do? One poster suggested that
    the ppc was trying to act as a DHCP server when this flag was on (seems
    unlikely, right?). I was reluctant to turn it off because of the above
    concern (e.g. the ppc needs to acquire a DHCP address from a router when used
    "on the road")--- right? or is it (seems absurd) a flag to allow the ppc to
    be a DHCP server?

    Many thanks again for you time and help.

    Best regards,
    dan
     
    Dan, Oct 9, 2006
    #9
  10. OK, I have the same basic hardware, an iMate K-Jam.

    Remote NDIS Host - the thing that ActiveSync uses when communicating with
    the device.

    NE2000-Compatible Driver - the NE2000 is a wired Ethernet chip. Not sure
    why this is here, but may be for OEM debugging. You'd never use it for
    anything yourself.

    SDIO WLAN Wireless Adapter - the WiFi stuff. This is what you'd set, if you
    want the WiFi adapter to be on some particular address.

    Note that, while connected to ActiveSync, the operating system in WM5 shuts
    down WiFi adapters, so, while connected via ActiveSync, yes, your SDIO WiFi
    adapter is disabled!

    The DHCP assignment flag indicates whether the adapter should go out looking
    for a server to assign it an IP address. In the case of Remote NDIS Host,
    no, that should be assigned the indicated static address. In the case of
    WLAN, whether it needs to be DHCP or static depends on the situation. DHCP
    is usually safe, as most access points can act as DHCP servers.

    Frankly, it's been so long since this thread started, I don't remember what
    the original question was. Remote NDIS Host *must* be statically-assigned.
    SDIO WLAN Wireless Adapter can be either, depending on what you need to do.
    WiFi *cannot* be active while ActiveSync USB is connected.

    Paul T.

     
    Paul G. Tobey [eMVP], Oct 9, 2006
    #10
  11. TweetyMalle

    Dan Guest

    Ok, I see that I can still get an address from the DHCP server on
    192.168.100.254 when I have the static 169.xxx address set, so I guess this
    necessarily means that the 169.xxx is for a different NIC, although it was
    anything but apparent.

    What about the DHCP registry flag per question below?

    Also any clarification about the nics in the device and access to set static
    or dynamic IP's for the various interfaces, and what they are, would be much
    appreciated.

    Sorry for talking past you, just to save you answering something I could
    find out for myself.

    best,
    dan

     
    Dan, Oct 9, 2006
    #11
  12. TweetyMalle

    Dan Guest

    Perfect!! Understandable and understood :))

    This thread was old, but there are many current threads elsewhere still
    asking the same or equivalent questions. Microworst should have published
    some understandable info or docs, but hey, what's new?

    best regards,
    dan

     
    Dan, Oct 9, 2006
    #12
  13. I'm sure that they don't expect this to stand still. Documenting something
    is a sure way to get some programmer to count on it and not write his code
    to be flexible enough to adapt to the next-version design. I think that's
    what they're trying to avoid. You can use WinSock or RAPI to write code
    that uses the ActiveSync connection, but don't count on how data is
    transmitted, over what medium, etc.

    Paul T.

     
    Paul G. Tobey [eMVP], Oct 9, 2006
    #13
  14. TweetyMalle

    Dan Guest

    Since you have the same hardware, one last question, if you know.

    The wifi radio is a bit insensitive. There is an external antenna jack, but
    the drift on the net and the service manual (obtained from the net) seem to
    show that this jack is only for the phone radio, not wifi.

    Have you bumped into any way, or any mods, for improving wifi sensitivity.
    It is not apparent what the wifi radio chip is connected to for an antenna- I
    would have guessed that the phone and wifi would share an antenna with
    loading coils or the like, but no clues.

    For home use the kludge solution is to improve local signal strength, but
    that doesn't work for walking about in Mountain View or SF (free wifi).

    This NOT the right thread I know, but as a thread posting adverse hermit, I
    don't know how to both post and insure you see this. tnx, dan
     
    Dan, Oct 9, 2006
    #14
  15. I know little about the hardware design, but I'd be surprised if a WiFi
    antenna connection was there. I'm sure that's the phone radio. There's
    nothing that you can do. It's either there or not; the antenna is either
    good enough or not. It's not a software problem.

    No, I'd be pretty surprised, again, if WiFi and the phone shared an antenna.
    Antenna design is a black art, but the size of the antenna is related to the
    frequencies which are to be received and sent. The phone and the WiFi
    frequencies don't really overlap. WiFi is in the 2.4GHz range and the K-Jam
    has the following GSM frequencies: 850MHz, 900MHz, 1800MHz, 1900MHz.

    Paul T.
     
    Paul G. Tobey [eMVP], Oct 10, 2006
    #15
  16. TweetyMalle

    Dan Guest

    Well, not that much of a black art really. I'm an engineer as well as a radio
    ham. If the antenna is physically small for the wavelength or the field is
    absorbed or blocked by its surroundings, propagation will be poor. Since the
    gsm frequencies are lower, ergo a quarter wave longer, the gsm antenna should
    be tunable (matchable) to 2450 without much pain-- but the loading might
    complicate design- I don't know how this is done (e.g. switching on the radio
    ic, switching loading coils/capacitance, or whatever).

    The phone radio seems to be pretty ok, as compared with the wifi. Even a
    laptop pcmcia wifi card seems *much* more sensitive. So I was thinking maybe
    there is almost no antenna on the wifi, or maybe just a piece of something
    which was orphaned in the design.

    I know it is not my unit because I swapped pda's with Tmobile and my wife
    has one which is about the same. The SDA's (mobile phone form factor and
    software) aren't noticibly better.

    No, I also don't see how software could help unless something can be
    switched in under program control. The only out I could see is maybe a
    splicing a piece of wire onto something hack-- ergo the external jack.

    Cheers. d
     
    Dan, Oct 10, 2006
    #16
  17. I'm sure that the latter, the surroundings, are the problem in this case.
    The WiFi is connected via SDIO to the processor and I suspect that it's a
    module purchased for the purpose. There's probably some sort of an internal
    antenna, but obviously, the casing of the device is all around it and is
    infused with metal.

    Yes, the WiFi range doesn't match my laptop's built-in whip antenna even
    close. I suppose that the idea of having an external antenna didn't appeal
    to the designers.

    Paul T.
     
    Paul G. Tobey [eMVP], Oct 10, 2006
    #17
  18. TweetyMalle

    modestdave Guest

    I had the same issue. The solution you provided below completely fixed the
    problem! Thanks!
     
    modestdave, Oct 26, 2008
    #18
  19. TweetyMalle

    zfpsops Guest

    Thanks Paul...probem solved. Many thanks

     
    zfpsops, Jan 8, 2009
    #19
  20. TweetyMalle

    chrisouth Guest

    Worked for me. Thanks
    Chris
     
    chrisouth, May 14, 2010
    #20
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