Net3193: A Virtual Circuit Error Occurred on the Session
ID: Q110222
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The information in this article applies to:
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Microsoft LAN Manager, versions 2.1, 2.1a, 2.2
SUMMARY
This error is common and most often indicates system conditions more than
a specific problem:
NET3193: A virtual circuit error occurred on the session to SERVERNAME.
The NCB command and return code is the data.
96 18
The values translate as follows:
- NCB = 96 = receive any
- return code = 18 = session ended abnormally
MORE INFORMATION
In plain English this means that errors other than simple time-outs are
preventing packets from reaching their destination. The command code, 96h
for an NCB indicates that the failed command is: NCB.RECEIVE.ANY, No-Wait.
Return code 18h indicates that the session ended abnormally or a time-out
occurred.
In most cases this error indicates genuine interference with session
traffic--conditions such as workstations being turned off without first
logging off, load spikes that drive network usage too high, and physical
network problems. Frequently, this error follows NCB time-outs on slow
WANs (where time-outs are frequent) and net3100s on networks experiencing
physical problems.
A network administrator looking for the source of the problem should first
determine if the condition is isolated to one server or is occurring on
all servers. It is common to see NET3193 errors scattered through an error
log when a link to another network goes down or somebody shuts off a server
without first logging it off. On large networks, where people tend to have
lots of connections, the error is relatively common.
Depending on your protocol requirements, try increasing the configuration
values of these PROTOCOL.INI parameters, in this order: DLCRETRIES,
NETBIOSRETRIES, NETBIOSTIMEOUT.
Finally, Net3193 errors on a virtual circuit between a LAN Manager server
and a Windows NT server (using NetBEUI) are also considered normal,
indicating autodisconnection of the session to an NT server. To reduce
these symptoms, increase the AUTODISCONNECT value on the NT server. See
article WIN_NT Q109555 for more information.
Additional query words:
Net error log neterror errorlog 2.10 2.1 2.1a 2.10a 2.20 2.2
Keywords :
Version : :2.1,2.1a,2.2
Platform :
Issue type :