Can't Unlock A520f , searching server error

[m.aminhaqjoo]

Hi z3x team , My internet works well but z3x can't find server , what the problem might be?

  UNLOCK INSTRUCTIONS:
    Unlocking with original MSL code:
    Warning! Knox warranty must be active (0x00)!
    If you have it voided (0x01(void)), then you can't unlock this phone with MSL.
  1. Phone must be powered on.
  2. Type *#0808# and select 'DM+ACM+ADB'.
  3. Run dialer and type *#0*# (service mode will apear).
  4. Connect the phone to USB cable, choose correct COM port in port settings.
  5. Press 'Unlock' button.
  6. Paste MSL code in new opened window and press 'OK'.
  
    Reading codes using sever:  
    Warning! Knox warranty must be active (0x00)!
    If you have it voided (0x01(void)), then you can't unlock this phone using sever.
  1. Power on the phone.
  2. Type *#0808# and select 'DM+MODEM+ADB'.
  3. Connect the phone to PC with USB cable, install drivers if needed.
  4. Press 'Read Codes via server' button, write your login and password in window if it will apear.
    (Login and password will be saved as default after first input and can be changed in settings) 

Operation: Read Codes via Server
Selected model: SM-A520F
Software version: 30.1

Checking Login and Password... OK
Ballance: 20 crd.
You have 20 credit(s) left. This opreratin takes 5 credits.Continue?  Yes
Searching Samsung modem... detected COM67
Reading phone info... OK
Model: SM-A520F
AP version: A520FXXU2BQH4
CSC version: A520FOXX2BQH4
CP version: A520FXXU2BQG7
Product code: XEU
Phone SN: R58JA69WXRP
Unique number: CBJ00B390FEE594
Searching Samsung diag port... detected COM68
Reading phone info... OK
CP version: A520FXXU2BQG7
CP build: Jul 21 2017 15:16:16
Reading data from phone... OK
Calculating... OK
Searching server... error
 could not connect to server

Done with Samsung Tool PRO v.30.1