cristy@eplrx7.uucp (John Cristy) (10/30/90)
Rlogin under Ultrix 4.0 frequently hangs when attempting to remote login to any of our Sun workstations (OS 4.0.3). Is someone aware of a fix for this problem? Please Email your replies to cristy@dupont.com. Thanks muchly in advance. -- The UUCP Mailer
steve@fnord.umiacs.umd.edu (Steve D. Miller) (12/07/90)
It was my understanding (from having had it happen to me, though only once or twice) that there is a bug in the SunOS 4.0.3 (and, probably, SunOS 4.0.X, but supposedly fixed in SunOS 4.1 and later) pseudo-tty code that would keep ptys from being reused properly. If memory serves, if someone logs out and leaves a process attached to the pty they're using, that pty becomes unusable, but things that allocate ptys don't know that (since they can open the tty, they assume it's OK to use), so they open the pty and then wedge. It's entirely possible that I'm getting the description of the bug wrong; since I haven't seen it in action often (we have only one SunOS 4.0.X machine), I haven't spent much time figuring out what's going on. I do know that there was a bug of this sort under SunOS 4.0.X (for some values of X), and that one of the behaviors one saw was hangs when doing remote logins to Suns. So you might want to upgrade your Sun to SunOS 4.1 or later (or call Sun Customer Support and get the pty fix) and see if the problem goes away. I know that I was able to log in just now from a DS5000/200 running Ultrix 4.0 to a SPARCstation 1+ running SunOS 4.1, though if the problem is intermittent, I'm not sure that proves anything. -Steve -- Spoken: Steve Miller Domain: steve@umiacs.umd.edu UUCP: uunet!mimsy!steve Phone: +1-301-405-6736 USPS: UMIACS, Univ. of Maryland, College Park, MD 20742