| 0x0001 | Invalid nick or password | 
| 0x0002 | Service temporarily unavailable | 
| 0x0003 | All other errors | 
| 0x0004 | Incorrect nick or password, re-enter | 
| 0x0005 | Mismatch nick or password, re-enter | 
| 0x0006 | Internal client error (bad input to authorizer) | 
| 0x0007 | Invalid account | 
| 0x0008 | Deleted account | 
| 0x0009 | Expired account | 
| 0x000A | No access to database | 
| 0x000B | No access to resolver | 
| 0x000C | Invalid database fields | 
| 0x000D | Bad database status | 
| 0x000E | Bad resolver status | 
| 0x000F | Internal error | 
| 0x0010 | Service temporarily offline | 
| 0x0011 | Suspended account | 
| 0x0012 | DB send error | 
| 0x0013 | DB link error | 
| 0x0014 | Reservation map error | 
| 0x0015 | Reservation link error | 
| 0x0016 | The users num connected from this IP has reached the maximum | 
| 0x0017 | The users num connected from this IP has reached the maximum (reservation) | 
| 0x0018 | Rate limit exceeded (reservation). Please try to reconnect in a few minutes | 
| 0x0019 | User too heavily warned | 
| 0x001A | Reservation timeout | 
| 0x001B | You are using an older version of ICQ. Upgrade required | 
| 0x001C | You are using an older version of ICQ. Upgrade recommended | 
| 0x001D | Rate limit exceeded. Please try to reconnect in a few minutes | 
| 0x001E | Can't register on the ICQ network. Reconnect in a few minutes | 
| 0x0020 | Invalid SecurID | 
| 0x0022 | Account suspended because of your age (age < 13) |