numbers with each block being
300 ports apart, e.g.
1..99,300..399,600..699 and so on
Why ports are 300 aparts. is any particular
reason there?

Yes    Java Port is 100 less than VNC Port both are required free:

 when you use port :0  it is BOTH 5800 & 5900
 when you use port :10  it is BOTH 5810 & 5910
 when you use port :90  it is BOTH 5890 & 5990
X11 [standard 'desktop at the keyboard' uses 6000] -- so you can't use 6000 or :100

When you use the next batch of available port numbers
 when you use port :300  it is BOTH 6100 & 6200   [so no conflit with 6000]
 when you use port :310  it is BOTH 6110 & 6210
when you use port :399 it is BOTH 6199 & 6299 [ next port conflict with 6200 ]





300 ports apart, e.g. 1..99,300..399,600..699 and so on.  Scanning
straight
through from 1..1000 should work, but will waste time scanning ranges
that
cannot be used because of port clashes.

Regards,

--
Wez @ RealVNC Ltd
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