USG 60 and ZyWALL 110 firmware 4.30 and 4.31 password must change; after change can not log in


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  • Hello,
    I have the same probleme in USG60W....
    in the documentation:

    What type of encryption is used?

  • Zyxel_Emily
    Zyxel_Emily Posts: 1,000
    Zyxel Certified Network Administrator - Security Zyxel Certified Sales Associate 100 Answers 500 Comments
     Guru Member

    Hi @Christophe31,

    The encryption algorithm cannot be provided.

  • Zelly
    Zelly Posts: 1
    First Comment First Anniversary
    Hi fellows. I was just affected by this incredibly sneaky bug. 
    I was prompted to set a new login for my admin-user at login. So I generated the quite complex password: [email protected]$9%hC^D&w which the box saved without comment.
    After this I could not login anymore. 

    After finding this thread I tried a couple of variations of the password with no success. Then I realized that $ is a common character to identify variables. Assuming that the Zywall took $ as a start of a variable (and probably would not accept % as part of a variable name) I removed $9 and logged in just fine. 

    So Andrea was on the right track. But it's not if it's ending with a special character, just remove one character after the $ until you find the right password. 

  • jw708
    jw708 Posts: 15
    First Comment Friend Collector Second Anniversary
     Freshman Member
    I'm having this problem, but the password started with ' and then alphanumeric characters. Any ideas?
  • Remo
    Remo Posts: 9
    First Comment Friend Collector Third Anniversary
    Running version V4.38 on a USG40W this problem still exists. No warning or error appeared after password renewal. For us this is a reason to change the supplier.
  • Zyxel_Charlie
    Zyxel_Charlie Posts: 1,034
    50 Answers 500 Comments Friend Collector Fourth Anniversary
     Guru Member
    edited November 2020
    With firmware: v4.39
    The account:admin with password: [email protected]$9%hC^D&w can be accepted by device, and I can login. Can you share what password are you using?
    What firmware are you using?

    If you meet the same issue(cannot login) because the password is expired, have to follow the FAQ to recover the configuration and set a new password.

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