Added workaround for nicehash.com if you use cryptonightv7.<region>.nicehash.com option variant=1 will be set automatically.

CHANGELOG.md

@@ -1,6 +1,7 @@
 # v2.5.3
 - Fixed critical bug, in some cases miner was can't recovery connection and switch to failover pool, version 2.5.2 affected. If you use v2.6.0-beta3 this issue doesn't concern you.
 - [#499](https://github.com/xmrig/xmrig/issues/499) IPv6 support disabled for internal HTTP API.
+- Added workaround for nicehash.com if you use `cryptonightv7.<region>.nicehash.com` option `variant=1` will be set automatically.
 
 # v2.5.2
 - [#448](https://github.com/xmrig/xmrig/issues/478) Fixed broken reconnect.

src/net/Url.cpp

@@ -180,6 +180,10 @@ void Url::adjust(int algo)
     if (strstr(m_host, ".nicehash.com")) {
         m_keepAlive = false;
         m_nicehash  = true;
+
+        if (strstr(m_host, "cryptonightv7.")) {
+            m_variant = xmrig::VARIANT_V1;
+        }
     }
 
     if (strstr(m_host, ".minergate.com")) {