Intermittent problems with a RFC receiver communication channel.

Hello.
I want to know how to get the total channel history for a RFC receiver communication channel (in RWB only last 5 calls are available).
We use this communication channel in a java mapping to run a RFC of the abap engine of XI. Sometimes the rfc doesn't work and mapping throws a mapping transformation exception. Then, without a modification, we reprocess the message in SXMB_MONI and it is processed without errors. We think that it could be caused by a huge message volume.
How can I get the maximum number of rfc calls that the rfc communication channel can admit simultaneously. Which parameters have influence in these calls?
Thank you very much.
Alberto.

1. Increase the maximum connections
from help.sap.com
Additional Parameters
Parameter ~~~~ Entry
Maximum Connections ~~ Maximum possible number of initial connections required between adapter and sender system. This value is limited internally to a maximum of 50.
2. /people/community.user/blog/2006/09/21/xi-rfcadapter-reconnect-issue

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