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.

{
    
}
#endif
static std::string GetDNSHost(const CDNSSeedData& data, ServiceFlags* requiredServiceBits)
{
    
    if (!data.supportsServiceBitsFiltering || *requiredServiceBits == NODE_NETWORK) {
        *requiredServiceBits = NODE_NETWORK;
        return data.host;
    }
    
    return strprintf("x%x.%s", *requiredServiceBits, data.host);
}
void CConnman::ThreadDNSAddressSeed()