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Uploads hang after 120 KBytes transferred (8 posts)

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  • Started 9 years ago by guest
  • Latest reply 9 years ago from Jim Matthews
  • guest Registered Member

    Hello,

    Can anyone suggest why Fetch 3.0.3 uploads via ADSL hang-up consistently after about 120 KBytes have been transferred? I have to use Force-Quit to leave the Fetch application after the hang-up. Using a 56K modem instead, the uploads all complete correctly! No problems with downloads or with web browsing.

    I have this problem on two PowerPCs: an 8500/120 and a 233 MHz Desktop M3979 G3, both running MacOS 9.1 (OT 2.7.4, TCP/IP 2.7.4). Same problem using two different ZyXEL P650-ME modems and from two locations 100 km apart (but the same ISP). No change on checking/unchecking PASV, changing the transfer buffer size, trying the demo version of 4.0.3, rebuilding desktop, reloading system, re-installing Fetch.

    Many months ago, all uploads worked perfectly with the same hardware and Fetch 3.0.3 but probably an earlier version of the MacOS. Sorry, I don't remember exactly which (a late 8 or an earlier 9?) and now I only have the CD-ROM for 9.1. I can't imagine the OS is the problem, so what could I have done wrong?

    Thanks,

    Bruce

    Posted 9 years ago #

  • Jim Matthews Administrator

    Some network equipment (such as ADSL modems and routers) can be mis-configured or have bugs that interfere with file uploads (but not with downloads, sending email, or other common tasks). So my first suggestion would be to ask the ISP or ADSL modem vendor about the issue.

    If that does not help I would suggest configuring your Mac to use a smaller MTU (maximum transmission unit -- the number of bytes in the packets that your computer sends). Some buggy modems and routers will work with a lower MTU setting. Let me know if you'd like more specific directions on doing that.

    Thanks,

    Jim Matthews
    Fetch Softworks

    Posted 9 years ago #

  • guest Registered Member

    Many thanks for your fast response and suggestions, Jim.

    The default MTU is 1500 bytes. Using IPNetTuner I have tried various MTUs as low as 80 bytes but the uploads still hang up after about 110 KBytes to 165 KBytes have been transferred.

    Before I upgraded the OS on the second Mac (bad move!), I had the problem with one computer and not the other. At that time, I swapped the modems and the problem stayed with the same computer. I also brought both Macs to the same location and tried them on the same telephone line. Again the problem was with one computer, not the other. So I think that the problem is not caused by the modem or ISP.

    Today I installed Fetch 3.0.3 in the Classic environment (MacOS 9.2.2) on a G5 PowerPC (MacOS X 10.3.7). I used the same installer as I used on the MacOS 9.1 classic Macs and with this computer uploading works perfectly to the same destination using the same modem, telephone line and ISP.

    What can I be doing wrong with Fetch on the MacOS 9.1 classic Macs?

    Bruce

    Posted 9 years ago #

  • Jim Matthews Administrator

    That is very strange. Have you looked into whether there's a newer ethernet driver than the one you have on those machines? Another possibility is that they both have bad ethernet ports (which would be quite a coincidence). You could test that theory by getting a PCI ethernet card.

    Thanks,

    Jim Matthews
    Fetch Softworks

    Posted 9 years ago #

  • guest Registered Member

    Hello Jim,

    I reloaded the Apple Built-in Ethernet Driver from my MacOS 9.1 CD-ROM. The driver is Version 1.0.5, dated Nov 1 2000. No change to the upload hang-up problem. When I run "Software update" it returns "Your software doesn't need updating". (I presume that what this means is that later versions of the classic MacOS, such as 9.2.1 or 9.2.2, cannot be run on this older platform).

    I don't have a PCI Ethernet card but I do have a PCI->USB card installed. So I borrowed a USB ADSL modem (ZyXEL Prestige 630C1) and tried that. The Fetch uploads worked perfectly with it.

    As you say, identical Ethernet port problems on two computers seem improbable and I believe the trouble began when I updated the system software of these computers. Is it possible to get an EARLIER version of the Apple Built-in Ethernet Driver anywhere?

    Thanks again,

    Bruce

    Posted 9 years ago #

  • Jim Matthews Administrator

    You could look for an earlier driver on earlier system CDs. I don't have any handy here.

    Or you could try a PCI ethernet card; they should be pretty cheap, if you can find one.

    Thanks,

    Jim Matthews
    Fetch Softworks

    Posted 9 years ago #

  • Haruki Member

    After months of this exact same problem and messing with settings, PASV, suspecting bad filenames, suspecting pre-corrupted data and then having the same problem using dreamweaver to upload I seem to have cracked it - thanks to this thread.

    I am using a G5 OS X 10.3.6. uploading via a 2Mbps ADSL connection. What seems to have worked was going to Preferences:Network;Built in Ethernet: reducing the MTUs to 500 (from 1500) AND killing Appletalk - problem files now upload fine.

    so, Thanks!

    Posted 9 years ago #

  • Jim Matthews Administrator

    You're welcome -- I'm glad the MTU trick worked for you.

    Jim Matthews
    Fetch Softworks

    Posted 9 years ago #

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