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 <[email protected]>: > 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 > >
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