On December 1, 1901, he became the executive officer on the cruiser Novik, whose construction he had been sent to oversee at the Schichau-Werke shipyards in Danzig, Germany.

After the end of the war, Porębski was promoted to lieutenant commander on December 6, 1906, and was assigned to the Russian Baltic Fleet.

During the early stages of World War I, Porębski was captain of the battleship, Imperatritsa Mariya, with the Russian Black Sea Fleet and was active in combat operations off of Bulgaria.

Porębski was promoted to rear admiral on April 19, 1916, and reassigned to command the cruiser squadron of the Black Sea Fleet.

Porebski also participated in the symbolic Poland's Wedding to the Sea performed by Polish president General Józef Haller in early 1920.

However, in 1925, he became embroiled in a political scandal involving the purchase of obsolete naval mines and was forced to resign his post.