Mark Wonsil writes:

>I have seen this happen recently.  The users using Telnet had no problems
>but new telnet sessions can take up to 15 minutes to start.  This is on 5.5
>pp7.  There was no trouble starting NSVT sessions at the same time.

When I see anomalies like this, I usually look for a DNS problem. On
Unix, at least, DNS is used to map IP addresses to names for use in
logging. If a DNS server is down, it can take several minutes for
requests to time out. If the server is configured or designed to require
that the reverse DNS result be returned before the service is allowed to
begin, this can explain long delays in trying to start network
connections to lightly-loaded systems.

That said, however, I don't know if MPE/iX's host-based Telnet uses
reverse DNS, or to what extent it tries to obtain a DNS response before
issuing a prompt.

-- Bruce


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