Telnet → Telnet Options
To adjust options for telnet connections, navigate to the Connection Type section of the Session Profile. These changes will apply to all connections using that session profile.
If you want to change the options for a single connection, click the Configure button in the Quick Connect window. For connections made through the Host Directory, use the Configure button found in the Host tab of your host directory entry.
The following options are available for telnet connections:
| Connect via Proxy | |
If you need to connect to your telnet host through a proxy you can enter
the name/ip and optional port (default port is 1080) here. If the proxy
is a SOCKS5 type, you can also provide username and password in the
form user:pass@ip:port.
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| Raw socket connection (pure TCP, no telnet) | |
This option generates a pure TCP connection without negotiating
telnet options with the remote host. This is useful if the server
is not a real telnet server but runs a different TCP based
protocol instead (e.g. SMTP or other RFC protocols).
| |
| Enable TCP Keep Alive | |
When this option is set, the telnet tcp stream is configured to send keep-alive packets to the remote hosts (technically this means that SO_KEEPALIVE is set on the socket). In addition to that, a TELNET NOP packet (FFh F1h) is sent every 60 seconds.
If this does not work, you can also set the idle
feature in the Idle Action section of the Session Profile
(see this article
Tutorial: Configure Timeout Settings).
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| Start session with local echo on | |
If this option is enabled, ZOC will use local echo (which is faster than
remote echo) when the session starts. However, during the login process
this option is often overridden (i.e. changed back to remote echo) by
the remote host.
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| Host may change terminal's local echo mode | |
Allows the host to change your local echo setting (Session Profile→Terminal).
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| Do not disconnect on errors | |
If a transmission error occurs, ZOC normally closes the connection. With this option checked, ZOC will keep the connection alive.
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| ADVANCED OPTIONS | |
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| Do not look up host names from IP address | |
If you connect to a host by using its IP ZOC normally looks up the host
name. You can turn this off, if you do not want this (e.g. because your
name server is slow or if you are connecting to ip addresses which do not
have names associated with them).
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| Connect IP-V4 only | |
If this option is enabled, DNS lookup will use IP-V4 addresses only.
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| Outgoing CR conversion | |
The list offers CR/LF (default), CR/NUL and CR only.
Choose CR/NUL if the host requires a NUL after a CR that is not followed by LF.
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| Host sends CR/NUL in binary mode | |
Try to enable this option if binary file transfers (e.g. Zmodem) through
Telnet connections fail.
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| Start session in binary mode | |
If enabled, ZOC will try to negotiate a binary session. This is sometimes
necessary for file transfers to work.
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| Port/Address where telnet will accept connections | |
If you use the Accept Connections function from the File menu,
ZOC listens here. The value is a port, ipv4-addr:port, or [ipv6-addr]:port.
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| Terminal Speed | |
Here you can enter the terminal speed in baud, if needed (e.g. 9600,9600). | |
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