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Re: error -1277
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Re: error -1277

> We are having a problem with our original iMacs' ethernet card not being
> able to auto sense to a 10MB hub. If I connect the original iMacs using
> a 100mb port they work fine, however if they are connected to 10mb port
> they give the error -1277 when they try to mount the log in screen at
> boot up time. We can not replace every 10mb hub have right now to 100mb
> so I need to force the iMacs ethernet card to connect at 10mb. Is there
> a way to do this?

OK, let's take this appart one layer at a time like I used to do
on PSINet's phone support calls. Ethernet is layer 2, IP is layer 3, TCP
is 4 and 5, AFP is 6, and Macintosh Manager is layer 7. (This is the ISO
model of networking. FYI, layer 1 is the computer itself.) Test each
layer one at a time in order to narrow the problems down. Your
description above shows that layer 7 isn't working. So let's test each
layer down until we find the one that works. The last one to not work is
the problem. Chances are rather high that the ethernet hubs are not the
problems.

To test AFP, boot from a CD-ROM, move the Macintosh Manager
extensions out of the System Folder, restart, and try to connect to an
AppleShare server.

To test TCP, try to load a web page. (This actually tests http,
which is another layer 6 protocol. But http and afp both use TCP.) Also
note that your workstations might be using AppleTalk instead of TCP and
IP. This would make AppleTalk your layers 3, 4, and 5. To test
AppleTalk, click on LaserWriter in the Chooser and see if you see your
other networked printers. (Assuming, of course, that you have such
printers and that they're usually visible via the LaserWriter driver....)
You can also open the AppleTalk control panel and see if the system has a
node number and network number in there. It would look something like
x.y, where both x and y are between 1 and 65,535.

To test the ethernet wiring and hub (not the iMac's ethernet
interface) put a different computer on that same port with that same patch
cable. If this fails, then it is probably the ethernet layer itself, not
the iMac. If it works for the other computers, but all the above tests
were good for the iMac while this test fails for the iMac, you probably
have a bad ethernet port on your iMac (replace mother board) or some bad
drivers. If its drivers, use the Software Restore CD-ROM that came with
your iMac and make sure to erase the current contents. If it still fails
after the MacOS is reinstalled like that, and other computers are OK, then
its probably hardware.

Good luck,
Jaime

--
Network Administrator
Cairo-Durham Central School District



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