The problem is the syntax you're trying to use in the Join function.
Look at the help topic (in the VBA editor, put the cursor on the word
Join and press F1) for the correct syntax -- the first argument must
be the name of the entire array you want to join, _not_ the string you
get by using the & operator to put the pieces together. In this case,

 port = Join(portarray, "/")

Since the code you originally showed, if corrected this way, would
just give back the starting value of the port variable, I assume you
have something else in mind. Do you want to get back the first three
parts of the starting string and discard any others that might be
there? There are a couple of ways to do that:

- Make another Variant variable, copy the first three parts of
portarray into it, and use Join to put them together. Note that this
method, like the one you showed, needs to verify that there are at
least three parts in the starting string, otherwise the macro will
stop with an error.

- Forget about Split and Join. Instead, use several applications of
Instr() to find the location of the third slash (if there is one),
then take the Left() of the original string up to but not including
that position.

--
Regards,
Jay Freedman
Microsoft Word MVP        FAQ: http://word.mvps.org
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newsgroup so all may benefit.

Like a detective looking for clues and testing the evidence.

You can use split via /, like before, to put data into an array.
Ubound(whatever_you_named_array) tells you the highest index number.(upper
boundary)
If its 0-5 elements you handle it one way, 0-6 the other way, not one of
those two, then pop up an error message explaining what might be wrong and
put focus back into the entry object.

If 2nd element is 1 character you handle it one way, if 3 characters the
other way, etc.

If you want to work backwards:
whatever_you_named_array(Ubound(whatever_you_named_array))
the last element will always be number like 1:0
whatever_you_named_array(Ubound(whatever_you_named_array) - 1)
is the next to the last element, etc.