TIC TCP Conn Failed [14:0x1c0169240]: 3:-9800 Err(-9800)

Hi everyone, this is my first times to ask some questions on the Forums🙂, and I hope everyone can understand what I say,

forgive me my poor english speaking.

First one, I encounter a big problem is I send a NSMutableURLRequest to the server with VPN(Virtual Private Network)

and create a NSURLConnection object to start to deliver my URL,

and setHTTPMethod:@"GET", but I can't success send the URL, I get a error message

It seems look like a message which sent From ios system .

Message is :

2017-12-19 19:43:18.250802+0800 xxxxxxxx[347:78704] TIC TCP Conn Failed [14:0x1c0169240]: 3:-9800 Err(-9800)

2017-12-19 19:43:18.251508+0800 xxxxxxxx[347:78704] NSURLSession/NSURLConnection HTTP load failed (kCFStreamErrorDomainSSL, -9800)

2017-12-19 19:43:18.251890+0800 xxxxxxxx[347:78704] Task <DF19BEEC-550C-47C6-8EF6-DF7F33354EB6>.<0> HTTP load failed (error code: -1200 [3:-9800])

2017-12-19 19:43:18.252651+0800 xxxxxxxx[347:78293] NSURLConnection finished with error - code -1200

By the way, I use VPN APP to connect ours inter server.

Another strange thing is if I use inter Wi-Fi, it can be sent to ours server, it means not to use VPN APP to connect the network.

Thanks everyone has seen my question, I hope someone can answer my question,

Thanks for reading.