Unable to connect to ACE30 from 3845/2811 -ssh - Invalid modulus length

Hi,
I`ve seen quite a lot of posts regarding SSH issues and the above SSH error. However the fix mainly involves upgrading clients but in this instance the client is are Cisco routers 3845 / 2811 - which we use for out and inband management.
Connectivity / routing etc is proven. Using SSH v2 the actual 6500 chassis where the ACE is physically located works fine. Configuring SSH v1 on the ACE module allows connections via the 3845/2811`s but we cannot use this.
Both have the following IOS Version 12.4(24)T4. I have tried various key sizes on the ACE module.
The SSH debug is :
Aug 8 09:44:00.755: SSH2 CLIENT 2: SSH2_MSG_KEXINIT sent
Aug 8 09:44:00.767: SSH2 CLIENT 2: ssh_receive: 536 bytes received
Aug 8 09:44:00.767: SSH2 CLIENT 2: input: total packet length of 776 bytes
Aug 8 09:44:00.767: SSH2 CLIENT 2: partial packet length(block size)8 bytes,nee ded 768 bytes,
 maclen 0
Aug 8 09:44:00.767: SSH2 CLIENT 2: ssh_receive: 240 bytes received
Aug 8 09:44:00.767: SSH2 CLIENT 2: partial packet length(block size)8 bytes,nee ded 768 bytes,
 maclen 0
Aug 8 09:44:00.767: SSH2 CLIENT 2: input: padlength 10 bytes
Aug 8 09:44:00.767: SSH2 CLIENT 2: SSH2_MSG_KEXINIT received
Aug 8 09:44:00.767: SSH2:kex: server->client enc:aes128-cbc mac:hmac-sha1
Aug 8 09:44:00.767: SSH2:kex: client->server enc:aes128-cbc mac:hmac-sha1
Aug 8 09:44:00.767: SSH2 CLIENT 2: send:packet of length 24 (length also inclu des padlen of 6)
Aug 8 09:44:00.767: SSH2 CLIENT 2: SSH2_MSG_KEX_DH_GEX_REQUEST sent
Aug 8 09:44:00.767: SSH2 CLIENT 2: Range sent- 1024 < 2048 < 4096
Aug 8 09:44:00.859: SSH2 CLIENT 2: ssh_receive: 424 bytes received
Aug 8 09:44:00.863: SSH2 CLIENT 2: input: total packet length of 424 bytes
Aug 8 09:44:00.863: SSH2 CLIENT 2: partial packet length(block size)8 bytes,nee ded 416 bytes,
 maclen 0
Aug 8 09:44:00.863: SSH2 CLIENT 2: input: padlength 10 bytes
Aug 8 09:44:00.863: SSH2 CLIENT 2: SSH2_MSG_KEX_DH_GEX_GROUP received
Aug 8 09:44:00.863: SSH2 CLIENT 2:
Invalid modulus length
Is there a fix for this issue ?
Many thanks for any tips/advise.

I`ve now tried a new version of the code incase it was a bug. ( 12.4 (24) T6 ) and various key sizes ( 768, 1024,2048, 4096) but no avail.
Oct 12 13:16:26.435: SSH CLIENT0: protocol version id is - SSH-2.0-OpenSSH_5.2
Oct 12 13:16:26.435: SSH CLIENT0: sent protocol version id SSH-2.0-Cisco-1.25
Oct 12 13:16:26.435: SSH CLIENT0: protocol version exchange successful
Oct 12 13:16:26.435: SSH2 CLIENT 0: SSH2_MSG_KEXINIT sent
Oct 12 13:16:26.447: SSH2 CLIENT 0: SSH2_MSG_KEXINIT received
Oct 12 13:16:26.447: SSH2:kex: server->client enc:aes128-cbc mac:hmac-sha1
Oct 12 13:16:26.447: SSH2:kex: client->server enc:aes128-cbc mac:hmac-sha1
Oct 12 13:16:26.447: SSH2 CLIENT 0: SSH2_MSG_KEX_DH_GEX_REQUEST sent
Oct 12 13:16:26.447: SSH2 CLIENT 0: Range sent- 1024 < 2048 < 4096
Oct 12 13:16:26.535: SSH2 CLIENT 0: SSH2_MSG_KEX_DH_GEX_GROUP received
Oct 12 13:16:26.535: SSH2 CLIENT 0:
Invalid modulus length
Oct 12 13:16:26.535: SSH CLIENT0: key exchange failure (code = 0)
Oct 12 13:16:26.535: SSH CLIENT0: Session disconnected - error 0x00

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My requirement is ABAP program should call java program through JCO. So i have created RFC destination in SAP machine.
I have created the java and ABAP programs also for the same.
After setting every thing I have executed a function module in ABAP which calls the java program.
This call is executing successfully once or twice out of 10 attempts of execution of the ABAP program.
I am getting below error
"Bean Y_TEST_RFCnot found on host XXXXXXX, ProgId =XXXX:
Can some one tell me why it is failing most of the times?
Regards,
Chaitanya.

Hi thanks for responding back to me.
I am already using unicode property. As i mentioned we are able to connect to RFC destination from ABAP program, but this connection is not consistent. Please check my server class (RFCServer_proj extends JCO.Server)constructor below.
public RFCServer_proj(String gwhost,String gwserv,String progid,IRepository repository)
 super(gwhost,gwserv,progid,repository);
 this.setProperty("jco.server.unicode", "1");
 JCO.addServerExceptionListener(this);
I am using another class to start the above server. Please check my server start up code below
private static RFCServer_proj serverConnections[] = new RFCServer_proj[20];
public static void startServers() {
Experian_props props=new Experian_props();
JCO.addClientPool(props.getProperty("jco_pool"), 20, props.getProperty("sap_client"), props.getProperty("sap_user") ,props.getProperty("sap_pwd") ,props.getProperty("sap_language"),props.getProperty("sap_host") ,props.getProperty("sap_sysnum"));
IRepository repository = JCO.createRepository("REP", props.getProperty("jco_pool"));
for(int i=0;i<CONNECTIONS;i++){
 serverConnections = new RFCServer_proj (props.getProperty("gwhost"), props.getProperty("gwservice"),
 props.getProperty("progid"),repository);
 serverConnections .start();
Here I am creating connection pool of 20 and server instances also 20. Intially I used single server instance.... after increasing the instances to 20 then my days become somewhat good. Connection is successful for every RFC call.
But is it correct way of doing?
I have used SAP server name as gateway host, gateway service as "sapgw00".
Do i need to set any thing in RFC destination?

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