There were many hacking attempts on Hillary Clinton's personal email server, through which she ran classified information while she was Barack Obama's secretary of state.

And it was so unsecured that the door to the server room at Clinton's residence sometimes wasn't even locked.

Or closed.

The information comes from emails obtained by investigators, reported BizPacReview.

In one email, Clinton aide Huma Abedin responded with a terse "OMG" when she was notified in the middle of the night the system was shut down because of unrelenting attacks.

Clinton used the private, unsecured email server from 2009 to 2013. She later was investigated for it, but then-FBI Director James Comey told the nation that while she had been "extremely careless" with classified information, the bureau would not refer charges.

"In one alarming email in 2011, Justin Cooper – the tech guy who oversaw Hillary's home email servers – alerted Clinton aide Huma Abedin of a hacking attempt in the middle of the night," the report said.

"In a tense email, Cooper wrote to Abedin at 2:57 a.m. on Jan. 11, 2011. 'I had to shut down the server. Someone was trying to hack us and while they did not get in i didn't want to let them have the chance to. I will restart in the morning.'

"Abedin responded with a single terrifying retort: 'omg.'"

BPR said that at 6:30 the next morning, Abedin emailed State Department officials: "Don’t email HRC anything sensitive. I can explain more in person."

The report said Cooper's notes also reveal Clinton's "server rooms" were frequently unsecured.

"Open door – not always secured, sometimes when HRC not @ residence was not closed. (both resid)," one message said.

He also had complained to Clinton about the lack of security.

"It is a constant fight to keep up with the security measures and unfortunately, we keep seeing reminders of why we need to," he wrote.

Cooper also admitted two instances of destroying Clinton's old cell phones by breaking them or hitting them with hammer.

Commented BPR, "Despite these shocking irregularities and mounting evidence that Hillary had mishandled classified intel that compromised national security, Barack Obama ordered the FBI to turn a blind eye to her gross negligence."

It's already been reported that a Chinese state-owned company hacked Clinton's server and installed code that forwarded a copy of all the emails that ran through the system.

That's one of the matters that President Trump wants investigated.