On the morning of September 29, IT departments of various brokerage firms intensively conducted business tests. At around 10 a.m. on Sunday, a person from the brokerage IT department told reporters, “Testing has already begun; we are so busy smoking.” An IT person at a medium-sized brokerage firm in Shanghai said that it has been working overtime at the company for three consecutive days from Friday to Sunday, and other brokerage firms in the industry are estimated to be about the same, mainly involving Friday's transaction settlement, test environment preparations, trading gateway changes, etc., while Sunday was in the testing cooperation phase. Over the weekend, many brokerage firms issued notices to customers saying that due to participating in today's network-wide testing of the industry, the restoration of trading system services this weekend was delayed until around the evening of September 29.

On the morning of September 29, IT departments of various brokerage firms intensively conducted business tests. At around 10 a.m. on Sunday, a person from the brokerage IT department told reporters, “Testing has already begun; we are so busy smoking.” An IT person at a medium-sized brokerage firm in Shanghai said that it has been working overtime at the company for three consecutive days from Friday to Sunday, and other brokerage firms in the industry are estimated to be about the same, mainly involving Friday's transaction settlement, test environment preparations, trading gateway changes, etc., while Sunday was in the testing cooperation phase. Over the weekend, many brokerage firms issued notices to customers saying that due to participating in today's network-wide testing of the industry, the restoration of trading system services this weekend was delayed until around the evening of September 29.