Error 503

#1
Hi,

i have the Problem, that my site will load fast, or produce Error 503.

The Error 503 will show up on every ~20 request

The RealTime Stats show no wait Queue and my Settings are these:

<tuning>
<maxConnections>2000</maxConnections>
<maxSSLConnections>200</maxSSLConnections>
<connTimeout>300</connTimeout>
<maxKeepAliveReq>1000</maxKeepAliveReq>
<smartKeepAlive>0</smartKeepAlive>
<keepAliveTimeout>5</keepAliveTimeout>
<sndBufSize>0</sndBufSize>
<rcvBufSize>0</rcvBufSize>
<eventDispatcher>best</eventDispatcher>
<maxCachedFileSize>4096</maxCachedFileSize>
<totalInMemCacheSize>20M</totalInMemCacheSize>
<maxMMapFileSize>256K</maxMMapFileSize>
<totalMMapCacheSize>40M</totalMMapCacheSize>
<useSendfile>1</useSendfile>
<etagNoInode></etagNoInode>
<SSLCryptoDevice>null</SSLCryptoDevice>
<maxReqURLLen>8192</maxReqURLLen>
<maxReqHeaderSize>16380</maxReqHeaderSize>
<maxReqBodySize>50M</maxReqBodySize>
<maxDynRespHeaderSize>4K</maxDynRespHeaderSize>
<maxDynRespSize>50M</maxDynRespSize>
<enableGzipCompress>1</enableGzipCompress>
<enableDynGzipCompress>1</enableDynGzipCompress>
<gzipCompressLevel>1</gzipCompressLevel>
<compressibleTypes>text/html, !text/css, !application/x-javascript</compressibleTypes>
<gzipAutoUpdateStatic>1</gzipAutoUpdateStatic>
<gzipCacheDir></gzipCacheDir>
<gzipStaticCompressLevel>1</gzipStaticCompressLevel>
<gzipMaxFileSize>1M</gzipMaxFileSize>
<gzipMinFileSize>300</gzipMinFileSize>
</tuning>

<extProcessor>
<type>lsapi</type>
<name>phpLsapi</name>
<address>uds://tmp/lshttpd/lsphp.sock</address>
<note></note>
<maxConns>10</maxConns>
<env>PHP_LSAPI_MAX_REQUESTS=1000</env>
<env>PHP_LSAPI_CHILDREN=10</env>
<env>LSAPI_AVOID_FORK=1</env>
<initTimeout>180</initTimeout>
<retryTimeout>0</retryTimeout>
<persistConn></persistConn>
<pcKeepAliveTimeout></pcKeepAliveTimeout>
<respBuffer>0</respBuffer>
<autoStart>1</autoStart>
<path>$SERVER_ROOT/fcgi-bin/lsphp4 -c /etc/php.ini</path>
<backlog>100</backlog>
<instances>1</instances>
<runOnStartUp>1</runOnStartUp>
<extMaxIdleTime></extMaxIdleTime>
<priority>0</priority>
<memSoftLimit>250M</memSoftLimit>
<memHardLimit>300M</memHardLimit>
<procSoftLimit>200</procSoftLimit>
<procHardLimit>200</procHardLimit>
</extProcessor>
 
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