Buenas tardes
Cordial saludo

tengo inconvenientes con un servidor CentOS release 5.10, para que mis usuarios se conecten vía VPN tipo Intranet, no he podido encontrar una solución, si me pueden colaborar les agradecería, adjunto logs cuando funcionaba y ahora.

Log funcionando:

Mon Oct 10 13:50:02 2016 193.60.90.72:23683 Re-using SSL/TLS context
Mon Oct 10 13:50:02 2016 193.60.90.72:23683 LZO compression initialized
Mon Oct 10 13:50:02 2016 193.60.90.72:23683 Control Channel MTU parms [ L:1543 D:163 EF:66 EB:3 ET:3 EL:0 ]
Mon Oct 10 13:50:02 2016 193.60.90.72:23683 Data Channel MTU parms [ L:1543 D:1453 EF:43 EB:133 ET:3 EL:0 AF:3/1 ]
Mon Oct 10 13:50:02 2016 193.60.90.72:23683 Local Options hash (VER=V4): '31aebcbb'
Mon Oct 10 13:50:02 2016 193.60.90.72:23683 Expected Remote Options hash (VER=V4): '3ebe1e45'
Mon Oct 10 13:50:03 2016 193.60.90.72:23683 CRL CHECK OK: /C=CO/ST=Valle/L=CALI/O=IMAWEBS_-_IMAWEBS/OU=Sistemas/CN=OpenVPN-CA/emailAddress=tecnologico@imawebs.com
Mon Oct 10 13:50:03 2016 193.60.90.72:23683 VERIFY OK: depth=1, /C=CO/ST=Valle/L=CALI/O=IMAWEBS_-_IMAWEBS/OU=Sistemas/CN=OpenVPN-CA/emailAddress=tecnologico@imawebs.com
Mon Oct 10 13:50:03 2016 193.60.90.72:23683 CRL CHECK OK: /C=CO/ST=Valle/O=IMAWEBS_-_IMAWEBS/OU=Sistemas/CN=imawebs_common_cert/emailAddress=tecnologico@imawebs.com
Mon Oct 10 13:50:03 2016 193.60.90.72:23683 VERIFY OK: depth=0, /C=CO/ST=Valle/O=IMAWEBS_-_IMAWEBS/OU=Sistemas/CN=imawebs_common_cert/emailAddress=tecnologico@imawebs.com
Mon Oct 10 13:50:03 2016 193.60.90.72:23683 TLS: Username/Password authentication succeeded for username 'usuario6'
Mon Oct 10 13:50:03 2016 193.60.90.72:23683 Data Channel Encrypt: Cipher 'DES-EDE-CBC' initialized with 128 bit key
Mon Oct 10 13:50:03 2016 193.60.90.72:23683 Data Channel Encrypt: Using 160 bit message hash 'SHA1' for HMAC authentication
Mon Oct 10 13:50:03 2016 193.60.90.72:23683 Data Channel Decrypt: Cipher 'DES-EDE-CBC' initialized with 128 bit key
Mon Oct 10 13:50:03 2016 193.60.90.72:23683 Data Channel Decrypt: Using 160 bit message hash 'SHA1' for HMAC authentication
Mon Oct 10 13:50:03 2016 193.60.90.72:23683 Control Channel: TLSv1, cipher TLSv3/SSLv3 DHE-RSA-AES256-SHA, 1024 bit RSA
Mon Oct 10 13:50:03 2016 193.60.90.72:23683 [imawebs_common_cert] Peer Connection Initiated with 193.60.90.72:23683

Log no Funcionando

Mon Oct 24 10:46:31 2016 193.60.90.72:60903 Re-using SSL/TLS context
Mon Oct 24 10:46:31 2016 193.60.90.72:60903 LZO compression initialized
Mon Oct 24 10:46:31 2016 193.60.90.72:60903 Control Channel MTU parms [ L:1543 D:163 EF:63 EB:3 ET:3 EL:0 ]
Mon Oct 24 10:46:31 2016 193.60.90.72:60903 Data Channel MTU parms [ L:1543 D:1453 EF:43 EB:133 ET:3 EL:0 AF:3/1 ]
Mon Oct 24 10:46:31 2016 193.60.90.72:60903 Local Options hash (VER=V4): '31aebcbb'
Mon Oct 24 10:46:31 2016 193.60.90.72:60903 Expected Remote Options hash (VER=V4): '3ebe1e45'
Mon Oct 24 10:46:32 2016 193.60.90.72:60903 CRL CHECK OK: /C=CO/ST=Valle/L=CALI/O=IMAWEBS_-_IMAWEBS/OU=Sistemas/CN=OpenVPN-CA/emailAddress=tecnologico@imawebs.com
Mon Oct 24 10:46:32 2016 193.60.90.72:60903 VERIFY OK: depth=1, /C=CO/ST=Valle/L=CALI/O=IMAWEBS_-_IMAWEBS/OU=Sistemas/CN=OpenVPN-CA/emailAddress=tecnologico@imawebs.com
Mon Oct 24 10:46:32 2016 193.60.90.72:60903 CRL CHECK OK: /C=CO/ST=Valle/O=IMAWEBS_-_IMAWEBS/OU=Sistemas/CN=imawebs_common_cert/emailAddress=tecnologico@imawebs.com
Mon Oct 24 10:46:32 2016 193.60.90.72:60903 VERIFY OK: depth=0, /C=CO/ST=Valle/O=IMAWEBS_-_IMAWEBS/OU=Sistemas/CN=imawebs_common_cert/emailAddress=tecnologico@imawebs.com
Mon Oct 24 10:46:34 2016 193.60.90.72:60903 WARNING: Failed running command (--auth-user-pass-verify): external program exited with error status: 1
Mon Oct 24 10:46:34 2016 193.60.90.72:60903 TLS Auth Error: Auth Username/Password verification failed for peer
Mon Oct 24 10:46:34 2016 193.60.90.72:60903 Control Channel: TLSv1, cipher TLSv3/SSLv3 DHE-RSA-AES256-SHA, 1024 bit RSA
Mon Oct 24 10:46:34 2016 193.60.90.72:60903 [imawebs_common_cert] Peer Connection Initiated with 193.60.90.72:60903

Significa que la autenticación de usuario/contrasela es incorrecta.