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Astronauts on ISS were forced to abort the docking of an unmanned upgraded Soyuz capsule today when it appeared to have problems locking onto its docking port.
According to NASA, Soyuz MS-14 entered an orbit above and behind the ISS, which would bring the spacecraft back into the vicinity of the outpost 24 hours later. However within an hour after the failed docking, the mission control in Korolev told the ISS crew that the next docking attempt would not be made until at least August 26 after a series of tests. Head of flight operations in Korolev Vladimir Soloviev informed the cosmonauts that ground specialists had narrowed down a potential root cause of the failure during docking to a “bad signal amplifier” in the Kurs-P avionics system aboard the station. Soloviev instructed the crew to swap the suspected amplifier for a new one and then conduct a test of the Kurs-P system. Provided the ongoing analysis confirmed the initial failure scenario and the in-orbit tests went successfully, another rendezvous attempt could be made in around 48 hours, between 08:00 and 09:00 Moscow Time on August 26. Soloviev asked the crew members whether they knew where the components in question had been located to which the cosmonauts said that they had remembered it approximately but asked for reference photos to be sent to them.
Assuming this is the same docking port the Russians have used for previous Soyuz and Progress dockings, the amplifier would have had to fail since the last docking.
UPDATE: It appears that they are instead going to use a different Russian docking port on ISS for the second docking attempt, thereby bypassing the suspect docking system.