Current bitcoin-master on testnet, `maxconnections=8` in the config file. Running in VM that doesn't have public IP and is not reachable from the Internet.

Wait until you have 8 peers.

```
telnet localhost 18333
```

It will result in:

```
Assertion failed: (nMaxInbound > 0), function AcceptConnection, file net.cpp, line 973.
```

First found in https://github.com/bitcoin/bitcoin/pull/8996, but can be reproduced on master.

{
    LOCK(cs_totalBytesSent);
    if (nMaxOutboundTimeframe != timeframe)
    {
        
        
        nMaxOutboundCycleStartTime = GetTime();
    }
    nMaxOutboundTimeframe = timeframe;
}
bool CConnman::OutboundTargetReached(bool historicalBlockServingLimit)
{
    LOCK(cs_totalBytesSent);
    if (nMaxOutboundLimit == 0)
        return false;
    if (historicalBlockServingLimit)
    {
        
        uint64_t timeLeftInCycle = GetMaxOutboundTimeLeftInCycle();
        uint64_t buffer = timeLeftInCycle / 600 * MAX_BLOCK_SERIALIZED_SIZE;
        if (buffer >= nMaxOutboundLimit || nMaxOutboundTotalBytesSentInCycle >= nMaxOutboundLimit - buffer)
            return true;
    }
    else if (nMaxOutboundTotalBytesSentInCycle >= nMaxOutboundLimit)
        return true;
    return false;
}
uint64_t CConnman::GetOutboundTargetBytesLeft()