SSL - F5 sending TCP RST after handshake

We just renewed server's SSL certificate with 2048 bit but now F5 is sending TCP RST to the server after Handshake.

 

It's working when we switch back to the old certificate (1024 bit) without changing F5 config.

 

Here is the SSLdump:

 

1 1 0.0010 (0.0010) C>S Handshake

 

ClientHello

 

Version 3.1

 

cipher suites

 

TLS_RSA_WITH_RC4_128_MD5

 

TLS_RSA_WITH_RC4_128_SHA

 

Unknown value 0x2f

 

Unknown value 0x35

 

TLS_RSA_WITH_3DES_EDE_CBC_SHA

 

TLS_RSA_WITH_DES_CBC_SHA

 

compression methods

 

NULL

 

1 2 0.0024 (0.0013) S>C Handshake

 

ServerHello

 

Version 3.1

 

session_id[32]=

 

50 ff 8c cf 7d cc 68 fe 70 b6 d3 15 6c 6e 7c da

 

f6 32 a3 45 48 53 69 e1 cc a4 f7 1e 68 9a 58 8c

 

cipherSuite TLS_RSA_WITH_RC4_128_MD5

 

compressionMethod NULL

 

Certificate

 

ServerHelloDone

 

1 0.0027 (0.0002) C>S TCP RST

 

 

I could connect to the server using "openssl s_client -cipher 'RC4-SHA' -connect".

 

The server is JBOSS. We're using BIG-IP 9.2.3.

 

Does anyone know why?