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Text File | 1992-01-28 | 6.5 KB | 136 lines | [TEXT/ALFA] |
- Troubleshooting uupc sessions
-
- Symptom: uupc can't place a phone call to your neighboring site.
-
- Possible cause: Systems file is malformed. Re-read the documentation and
- check the file. If necessary, run uupc with a debug level of 5, and watch
- the screen as uupc parses the lines in the file and tries to make sense of
- them. You may be able to figure out where the problem lies.
-
- Possible cause: you have specified the HAYES dialer, and your modem is not
- Hayes-compatible. Try using the DIR "dialer", which isn't a dialer at all...
- it simply opens a serial-port connection and then starts running the chat
- script. You can use the chat script to dial your modem.
-
-
- Symptom: uupc dials the phone, your neighbor's modem answers, but uupc
- reports "Login failed".
-
- Possible cause: the send/expect strings in the chat script are not correct.
- Run uupc with a debug level of 5, observe what uupc expects to receive from
- your neighbor's system and what it really receives, and edit your send/expect
- strings to suit. You may need to add some delays, or change the expect
- timeout, or add some try-again strings.
-
- Possible cause: speed-switching problems. You have configured the serial
- port to a higher speed than that of the modem-to-modem link (e.g. you specified
- 9600 in the Systems file, and the modem which actually answers speaks only
- at 2400 bits/second). Your modem is reporting the actual speed of the
- connection in its CONNECT message (e.g. "CONNECT 2400"). Either uupc is
- switching its serial-port speed to match that of the CONNECT message, and
- the modem isn't (solution: specify the dialer as HAYES! or HAYES!options,
- rather than as HAYES or HAYES+options)... or, the modem is switching speeds,
- and uupc isn't (change your HAYES! dialer specification to HAYES or
- HAYES+options, or change your HAYES!options specification to include
- an option to instruct the modem not to switch speeds).
-
-
- Symptom: uupc establishes a connection, but never says "Startup"
-
- Possible cause: uucp misconfiguration at your neighbor's site. Run uupc
- with a debug level of 5, and make note of what your neighbor's system
- says after uupc logs in. Take this information to your neighbor's
- sysadmin.
-
- Possible cause: noisy phone lines. The early stages of the uucp protocol
- negotiation are not protected by the 'g' protocol and can be disrupted
- by line noise. Try again.
-
- Possible cause: your connection to your neighbor's system is not to a
- hardwired serial port, but to a network terminal server. The server is
- not passing data through to the system you're calling until it sees a
- carriage-return. uucp 'g' packets don't have carriage returns. Ask your
- neighbor sysadmin how to instruct the terminal-server to go into
- "download" or "transparent" or "push" mode, and add the necessary
- commands to your chat script.
-
-
- Symptom: uupc gets through the Startup phase, and the conversation fails
- immediately thereafter: either the phone hangs up, or uupc starts reporting
- "header checksum error" and disconnects due to an excessive error count.
-
- Possible cause: You have specified a large-packet 'g' protocol connection,
- and are talking to a system which cannot construct large packets without
- scrambling the packets or dumping core and aborting. Revert to a
- standard-sized-packet session (64 bytes), or try 128-byte packets.
-
-
- Symptom: uupc gets through Startup phase, starts sending or receiving
- files, and the file transfer halts part way thorough one file. The
- session finally ends in an excessive-error-count disconnection.
-
- Possible cause: extremely noisy phone line is overwhelming the 'g'
- protocol's error-recovery capability. Try a different phone line.
-
- Possible cause: one of the modems involved in the communication is
- configured for XON/XOFF flow control, an XOFF character was transmitted
- as part of a 'g' protocol packet, and the modem has interpreted this as
- a "stop sending data" command. Reconfigure the modems... the 'g'
- protocol is entirely incompatible with XON/XOFF flow control.
-
- Possible cause: you have specified a larger-than-normal 'g' protocol
- window (e.g. 7 packets). Your neighbor system has agreed to a larger window,
- but can't really handle it... your neighbor's serial-port buffers are
- overflowing. Switch back to a 3-packet window.
-
-
- Symptom: files are transferred properly, but throughput is poor.
-
- Possible cause: neighbor system is overloaded. Try calling later.
-
- Possible cause: noisy line, leading to many retransmissions. Try calling
- later.
-
- Possible cause: you are running LocalTalk, and its interrupts and SCC
- polling are causing your modem port to drop characters, leading to
- excessive retransmissions. Turn off LocalTalk while running uupc, or
- switch to a lower serial-port speed.
-
- Possible cause: you are running a standard 'g' protocol connection (3-
- packet window, 64-byte packets) over an MNP or V.42/V.42bis modem
- connection. MNP or V.42 is slowing down the ACK packets enough to lead
- to protocol stalling. Turn off MNP or V.42/V.42bis, or try a larger
- window or packet size.
-
- Possible cause: you are communicating with a Mac/gnuucp system. Mac/gnuucp
- (up through version 4.6 at least) supports only a one-packet window,
- and is limited to about 200 bytes/second of throughput no matter how
- fast your modems may be. Install uupc 3.0 at the affected system.
-
- Possible cause: you are transferring files using the 'f' protocol, over
- a connection which is not "almost error-free". The entire file is being
- retransmitted several times. Switch to the 'g' protocol, or use an
- error-correcting protocol such as MNP or V.42/V.42bis.
-
-
- Symptom: you instruct uupc to call "Sites with jobs pending" or "Per
- schedule file", and it doesn't call one or more sites which have jobs
- pending or which appear to be due for a call.
-
- Possible cause: the time-of-day restrictions in the Systems file forbid
- calling the site(s) in question at this time. Wait until later, or edit
- the Systems file and remove the time restrictions.
-
- Possible cause: the entry in the Schedule file may be in error. Check it
- and correct it if necessary.
-
- Possible cause: one or more failed attempts to call the site(s) in question
- have triggered the failed-call fallback algorithm, which forbids calling
- a site for 5 minutes after the first failed call, 10 minutes after two
- failed calls, 20 minutes after three, and so forth. Force a call to the
- affected system by selecting its name from the Call menu (this overrides
- the fallback algorithm), or add a specific fallback time to the appropriate
- line in the Systems file, or throw away the "ST.systemname" status file
- in the spool folder.
-
-