[Simh] OpenVMS 7.2 VAX telnet failure

[Lorenzo]

What nmap is reporting should be the traffic from the VAX to the client.
No matter the client I use (e.g. telnet.exe, PuTTY...), all I get is an
endless stream of chars, which matches what appears in the traffic dump.
Upgrading to SIMH 4.0 beta had no effect - after 14 hours I experienced the
same exact problem.
During the telnet outage, which happened after ~14 hours of SIMH running,
FTP was still working fine.


2014-04-30 2:50 GMT+02:00 Rick Murphy <rick at rickmurphy.net>:

> At 06:21 PM 4/29/2014, Lorenzo wrote:
>
>> Hi!
>> I'm running OpenVMS 7.2 VAX on a simh emulator, latest release
>> (V3.9-0 from <http://simh.trailing-edge.com>simh.trailing-edge.com) and
>> compiled with networking (libpcap, no vde).
>>
>> The emulator has got its own network card to which it's attached.
>> The host operating system is Linux, kernel 3.11.
>> My issue is that after an apparently random amount of time (usually a few
>> hours) the telnet server stops working.
>> I can't get any client to log in remotely - as soon as I connect to the
>> OpenVMS machine,
>> all I get is a blank character sequence, as follows (dumped by nmap):
>>
>> SF:NULL,1138,"\xff\xfb\x01\xff\xfb\x03\xff\xff\xff\xff\0\
>> 0\0\0\0\0\0\0\0\0
>>
>
>
> There's a beginning of some TELNET options negotiation going on there.
>
> That's the following:
> 255 (IAC)
> 251 (WILL)
> 1   (ECHO)
> 255 (IAC)
> 251 (WILL)
> 3   (SGA) [Suppress go-ahead)
>
> That's pretty standard.
> The series of 0xff (IACs) and nulls that follow aren't.
>
> You really need to capture the traffic to-and-from. Is this coming from
> the VAX to your client, or vice versa?
>         -Rick
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.trailing-edge.com/pipermail/simh/attachments/20140430/a41efd6e/attachment-0002.html>