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TOPIC: Incoming Binary Zmodem Transfer Fails
#1757
Re: Incoming Binary Zmodem Transfer Fails 5 Years, 3 Months ago  
1. US-English, no localization.

2. No. An old, decrepit computer running Windows 98 is all I have and have access to. If this old machine ever breaks down, I am out of luck. (Some of us are behind the technology curve and can't do anything about it. We're lucky to have anything at all.)

3. NetBSD 3.1_RC3, according to the login of the shell host. I don't know what kind of front end servers are involved.

4. 'sz --version' shows "sz (lrzsz) 0.12.20". It is whatever is supplied by my ISP. I never previously had a problem transferring files. I don't know what changed, as not long ago I was able to transfer even binary or large Ascii files with A.T. v3.85.

5. So far as I understand, I cannot give you temporary login without giving you total access to my account with my userid and login password, and that would violate my subscription agreement with my ISP, if I recall correctly. My ISP is a commercial enterprise in New York City, and they run a tight ship. Bend the rules and you're out on your ear.
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#1758
Re: Incoming Binary Zmodem Transfer Fails 5 Years, 3 Months ago  
A bit more. I can upload and download Ascii files in the 10's of KB size range with no trouble. But I am wondering if there is a filesize problem involved. I tried to upload a 379KB ZIPfile and ran into trouble. For a long time after the transfer started the dial-up networking icons in the system tray flashed on and off back and forth, but eventually the message box disappeared, and all I got was "square box" characters at the shell prompt, and it took 14000 ^C's to break things loose. An attempt to upload an 87KB ZIPfile also failed with the same problem.
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#1759
Re: Incoming Binary Zmodem Transfer Fails 5 Years, 3 Months ago  
ADDITIONAL INFORMATION

Usually I use A.T. in SSH-2 mode for the security. However, not long ago I decided to try an experiment. Rather than login to my shell host with SSH-2, I tried straight TELNET. Now I got some different results.

I was able to download large files with Zmodem in both Ascii (almost 1M and binary (>700K modes correctly. One was a PDF (binary) and the other was a UUENCODE (Ascii) of that same file. Both were received on my Win98 machine correctly. The Ascii file UUDECODEd correctly, and both versions of the PDF were good. So there is a first impression that somehow SSH-2 as such may be involved.

There is still the erroneous message about the download directory being missing, even though it isn't. I have to go through the directory browse and select it, and even then the download process still squawks. I have to go through that a time or two and then Cancel, and the download starts. I don't know what is going on here.

HOWEVER, I cannot upload successfully in TELNET mode, either Ascii or binary. I start 'rz -a[b]' on the shell host. Then I get the usual browse box to select the file. I select the file, and the browse box pops up again. I select the file a second time, and then the upload supposedly starts. But within just a second or two the Zmodem progress window closes, some gibberish shows up on the shell host, and I have to ^C out to interrupt.

So at least there is something else involved. I can download in TELNET mode but not in SSH-2. I can upload small files in SSH-2 but cannot upload large files in SSH-2 or anything in TELNET. (I do want to be able to use SSH-2 for the security.)

Finally, as I have mentioned before, there seems to be a visual glitch in the Zmodem window. It appears that the "Packets Transmitted" label is truncated.
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#1760
Re: Incoming Binary Zmodem Transfer Fails 5 Years, 3 Months ago  
I'm not ignoring you, I'm just having trouble reproducing this bug in order to fix it.

Is there anything about your box that I should be aware of? Custom shells, desktop, program launchers, or task switchers?

Anything out of the ordinary?
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#1761
Re: Incoming Binary Zmodem Transfer Fails 5 Years, 2 Months ago  
I am not aware of anything out of the ordinary with the software. This is a very generic Windows 98 machine. I have all the critical updates installed that Microsoft made available up to the time that they dropped support for 98. You could say that it is plain vanilla. I can't think of anything that has changed since I was able to transfer large files with version 3.85.

I did drop back to 3.85, as it suits my needs as long as I can make the file transfers. Just to check I logged into a different shell host (I have a choice of five) from the one I usually use. There was no diference in the results.

It seems to be a file size issue with 3.85. I was able to succesfully download both Ascii and binary files in the 115 - 200 KB range with no problems. Attempting to download a larger file failed. Uploading any file of much more than about 26 KB -- that is the largest file I tried -- in either Ascii or binary fails. The progress meter quickly -- very quickly -- shoots up to about about 115 KB (and I don't see how that much data could possibly be transferred that quickly over a slow dialup link) and then hangs. Eventually the transfer message box disappears and it takes many, many, many ^C to the shell host to regain control.

Now that I think of it, one thing has changed, although I don't know whether that was in relation to the inability to transfer large files, as usually I am only transferring small to medium files.

I have only a dialup connection with a modem. Some time back I had a major hardware problem and now have a different motherboard in the machine. I also had to install a different modem with a different driver. My usual connect speed used to be 26400. About the same time as I made the hardware change one day I noticed a telephone repairman diddling around the apartment building. Since that time, my usual connect speed has dropped to 24000. I know the machine and modem are capable of more, because when someone else (I am not a hardware type) installed the modem and driver in another location we got a connect speed of 31600. So there does seem to be a hardware limitation on connect speed in my particular location. Whether any of this coincided with the inability to transfer large files with 3.85 I can't say, as I do not recall when I had last tried to transfer a large file until I started this thread.

But I am definitely suspicious about how the progress meter shoots up in just a few seconds to 115 - 120 KB when trying to upload a large file.
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#1762
Re: Incoming Binary Zmodem Transfer Fails 5 Years, 2 Months ago  
Would some sort of debugging data help? I have DebugView installed on this machine. It has been quite a while since I used it, but I am sure I could fire it up again for a version of A.T. that has debugging points.
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