sv_max_clients
can no longer be changed.
However, it is possible to set it to a different value in the rcon. It does not take effect, though.
Solutions:
sv_max_clients
ingame (possibly a lot of code changes and dynamic allocations?)
sv_max_clients
m_pConnlessPacketList
was being set to zero after the first item is deleted, which leaks the remaining item's memory.
Use Compress/Decompress of CNetBase so we can more easily move them somewhere else in the future.