On Thread #1057057, WW post this issue.
It is a bug for me.

Expected: VFP it has to allow string of connection with more of 254 characters

CLEAR
ON ERROR ? MESSAGE()
x=SPACE(254)
? SQLSTRINGCONNECT(x) && ok a ODBC error
x=SPACE(255)
? SQLSTRINGCONNECT(x) && bug, a VFP error