Oct 18 07:11:30 charon 06[CFG] <con-mobile|25> received proposals: ESP:AES_CBC_256/HMAC_SHA1_96/NO_EXT_SEQ, ESP:AES_CBC_256/HMAC_MD5_96/NO_EXT_SEQ, ESP:AES_CBC_128/HMAC_SHA1_96/NO_EXT_SEQ, ESP:AES_CBC_128/HMAC_MD5_96/NO_EXT_SEQ, ESP:3DES_CBC/HMAC_SHA1_96/NO_EXT_SEQ, ESP:3DES_CBC/HMAC_MD5_96/NO_EXT_SEQ
Oct 18 07:11:30 charon 06[CFG] <con-mobile|25> configured proposals: ESP:AES_CBC_256/HMAC_MD5_96/MODP_2048/NO_EXT_SEQ, ESP:AES_CBC_256/HMAC_SHA1_96/MODP_2048/NO_EXT_SEQ, ESP:AES_CBC_256/HMAC_SHA2_256_128/MODP_2048/NO_EXT_SEQ, ESP:AES_CBC_256/HMAC_SHA2_384_192/MODP_2048/NO_EXT_SEQ, ESP:AES_CBC_256/HMAC_SHA2_512_256/MODP_2048/NO_EXT_SEQ, ESP:AES_CBC_256/AES_XCBC_96/MODP_2048/NO_EXT_SEQ, ESP:AES_CBC_192/HMAC_MD5_96/MODP_2048/NO_EXT_SEQ, ESP:AES_CBC_192/HMAC_SHA1_96/MODP_2048/NO_EXT_SEQ, ESP:AES_CBC_192/HMAC_SHA2_256_128/MODP_2048/NO_EXT_SEQ, ESP:AES_CBC_192/HMAC_SHA2_384_192/MODP_2048/NO_EXT_SEQ, ESP:AES_CBC_192/HMAC_SHA2_512_256/MODP_2048/NO_EXT_SEQ, ESP:AES_CBC_192/AES_XCBC_96/MODP_2048/NO_EXT_SEQ, ESP:AES_CBC_128/HMAC_MD5_96/MODP_2048/NO_EXT_SEQ, ESP:AES_CBC_128/HMAC_SHA1_96/MODP_2048/NO_EXT_SEQ, ESP:AES_CBC_128/HMAC_SHA2_256_128/MODP_2048/NO_EXT_SEQ, ESP:AES_CBC_128/HMAC_SHA2_384_192/MODP_2048/NO_EXT_SEQ, ESP:AES_CBC_128/HMAC_SHA2_512_256/MODP_2048/NO_EXT_SEQ, ESP:AES_CBC_128/AES_XCBC_96/MODP_2048/NO_EX
Oct 18 07:11:30 charon 06[IKE] <con-mobile|25> no matching proposal found, sending NO_PROPOSAL_CHOSEN
That looks more like P2 mismatch there, again, there was no match between what the client wants and what your firewall is configured to send. Looks like the client doesn't want PFS.