Thread View: comp.sys.ibm.pc.rt
3 messages
3 total messages
Started by Robert Keller
Wed, 17 May 1989 21:12
TCP connections being reset
Author: Robert Keller
Date: Wed, 17 May 1989 21:12
Date: Wed, 17 May 1989 21:12
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The problem: At unpredictable intervals our IBM-RT resets individual telnet TCP connections. More Detail: I am using NCSA telnet software (2.2D) running on an AT class machine using a 3C503 ethernet board. The local internet has Vaxes, Suns, the RT, and various 386 unix boxes as hosts, and several "terminal" setups as described above. The resetting of the TCP connection happens only when logged on to the RT. Only one telnet session is reset at a time, i.e. if several people are logged in with telnet they are not all bumped off at once. specs: AIX 2.2.1, IBM baseband adapter with thin wire tranceiver, Advanced Processor card, ESDI controller, 4-port serial board, Advanced Monochrome card, Dos co-processor board, 4Meg memory. what is happening? confused, ...rob
Re: TCP connections being reset
Author: Nicholas J. Simicich
Date: Tue, 30 May 1989 03:05
Date: Tue, 30 May 1989 03:05
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In article <304@matrox.UUCP> rob@matrox.UUCP (Robert Keller) writes: >The problem: > At unpredictable intervals our IBM-RT resets individual telnet > TCP connections. (.....) >specs: AIX 2.2.1, (...) Is it possible, perchance, that the machines you are talking to do not support keepalive? I think that AIX 2.2.1 requires that the far end support keepalive. Also, have you called in to get a recent service level? -- Nick Simicich --- uunet!bywater!scifi!njs --- njs@ibm.com (Internet)
Re: TCP connections being reset
Author: Jim Morton
Date: Sat, 03 Jun 1989 19:02
Date: Sat, 03 Jun 1989 19:02
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In article <618@scifi.UUCP>, njs@scifi.UUCP (Nicholas J. Simicich) writes: > In article <304@matrox.UUCP> rob@matrox.UUCP (Robert Keller) writes: > >The problem: > > At unpredictable intervals our IBM-RT resets individual telnet > > TCP connections. > Is it possible, perchance, that the machines you are talking to do not > support keepalive? > I think that AIX 2.2.1 requires that the far end support keepalive. > Also, have you called in to get a recent service level? Nick hit it right on the head. We changed out socket based DOS application to support keepalive and bingo - stopped dropping connections! Unfortunately this is mentioned nowhere in the "Interface Program for TCP/IP" manual... Thanks, Nick! -- Jim Morton, APPLiX Inc., Westboro, MA ...uunet!applix!jim jim@applix.com
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