[ngw] GWIA 420 TCP error

hbueno hbueno at microdsi.net
Thu Jul 5 01:28:09 UTC 2001


Hmm, what's an authentication packet?

I guess this is possible on our end, although it wouldn't explain why
mail to those trouble domains generally gets through.

Hugo


Dan Prill wrote:
> 
> We were having trouble with TCP Read errors on a few domains for a while until I discovered that mail servers in those domains were sending back authentication packets that our firewall was blocking. Once I opened up the firewall to those packets, the TCP Read errors went away.
> 
> Dan
> 
> >>> hbueno at microdsi.net 07/03/01 02:46PM >>>
> Just to clarify, this is a GWIA problem.  The rest of the GW system
> works just fine.
> 
> Hugo
> 
> Brian Volpone wrote:
> >
> > Does your system hang on the TCP Write Errors? Things get slow and
> > GroupWise is totally inaccessible? Try "Reinitialize System" at the
> > server console prompt.
> >
> > I don't know why this happens, but at least that gets things running
> > again. Judging by some things that have happened here, I'm theorizing
> > it's got something to do with the nic, but I don't know that.
> >
> > Brian Volpone, CNE
> > Network Support Specialist/Network Administrator
> > LUTHERCARE, Lititz, PA
> > email: bvolpone at luthercare.org  OR bvolpone at success.net
> >
> > >>> hbueno <hbueno at microdsi.net> 07/02/01 06:06PM >>>
> > We started getting these errors last Monday.  Some email to certain
> > domains cannot be  sent even though the address is correct and message
> > is formatted properly.  The strange thing is it happens only to
> > certain
> > domains, and not all messages to those domains are affected.  Message
> > sizes range in size from 4K to 5 or 6 MB.  Per Novell TIDs, this is
> > not
> > a GWIA problem.  They suggest using route.cfg to hard code the mail
> > exchangers for those trouble domains.  However, I see this solution
> > can
> > become very cumbersome over time.
> >
> > Has anyone else experienced 420 TCP Write (or Reda) errors?  Any fix?
> >
> > My system (and GWIA) is GroupWise 5.5 SP4 running on NW 5.1 SP2A



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