The server always crashes by polhook.dll...

[02/08 20:50:53] Client#223 (119.124.*.*): disconnected (account 173online)
Unknown ClientEncryptionVersion ignitio, using version 1.26.4
Client#224 connected from 119.124.111.141 (21 connections) on interface 192.168.1.165
Account 173online logged in from 119.124.*.*
Structured exception in POL093-2001-07-22 compiled on Jul 22 2001 at 10:57:43
//=====================================================
Exception code: C0000005 ACCESS_VIOLATION
Fault address: 003F110D 01:0000010D D:\POL\POLHook.dll

Registers:
EAX:00000698
EBX:13CB0FE0
ECX:00000002
EDX:00000003
ESI:13CB0FE1
EDI:13CA8000
CS:EIP:001B:003F110D
SS:ESP:0023:16C3FB48 EBP:13CA72D8
DS:0023 ES:0023 FS:003B GS:0000
Flags:00010202

How to fix it?

Sounds like you have a typo in your pol.cfg.

Unknown ClientEncryptionVersion ignitio, using version 1.26.4

This option should look like that:

pol.cfg entries wrote: for ClientEncryptionVersion, the allowable values are '1.26.4', '2.0.0', 'ignition', 'uorice', and 'none'. Here, 'ignition', 'uorice', and 'none' all mean 'no encryption'.

Oooooh.... voices from the past