When trying to open an X application on a remote display,
I am getting
No protocol specified
Error: cannot open display: 192.168.200.61:0
The "No protocol specified" message is bogus: the display is
specified correctly*, and the same operation -- with exactly
the same setting of DISPLAY -- was working yesterday. There's
no problem with network connectivity between the two systems:
ping and rlogin both work in either direction, and the specified
X server is running and accepting connections.
What does that message actually mean, and how do I fix it?
* According to the X manpage, a non-empty hostname or IP address,
separated from the display number by a single colon, specifies
the use of TCP/IP communication protocol. BTW I get the same
result using either the {ipaddress}:0 or the {name}:0 notation,
and with or without a trailing .0; 192.168.200.61:0.0 and
192.168.200.61:0 both fail in the same way.
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