Generally, the 9th lord in the 8th house destroys fortune; but if Jupiter is the 9th lord (as in Aries/Cancer ascendants) and occupies the 8th house, it becomes exceedingly auspicious.
Verse 2 — 8th and 9th Lords Connection Confers Fame in 8th Lord's Dasa
रन्ध्रेशभाग्यनाथौ चेत् सम्बद्धौ च परस्परम् ।
रन्ध्रेशस्य दशाकाले कीर्तिं राज्यं लभेन्नरः ॥ २ ॥
randhreśabhāgyanāthau cet sambaddhau ca parasparam |
randhreśasya daśākāle kīrtiṃ rājyaṃ labhennaraḥ || 2 ||
If the lord of the 8th and the lord of the 9th are related by conjunction or aspect, the native attains royal power, executive authority, and fame during the Dasa of the 8th lord.