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7a2c7a414c
In logs that were provided to me phpseclib sent a packet that was 2536 bytes long (excluding the bytes denoting the channel and data length) but the length packet said it was 32764 bytes long (ie. $max_size). So when $max_size is less than the data being sent and has to be adjusted by a new window adjust message from the server and the adjustment makes $max_Size bigger than the data being sent over problems arise. SSH's window size has caused issues before. Overall I don't think the SSH specs really explain the window size very well. I opened up an errata on SSH's RFC a while back about the issue.
phpseclib - PHP Secure Communications Library
MIT-licensed pure-PHP implementations of an arbitrary-precision integer arithmetic library, fully PKCS#1 (v2.1) compliant RSA, DES, 3DES, RC4, Rijndael, AES, Blowfish, Twofish, SSH-1, SSH-2, SFTP, and X.509
PEAR Channel: [phpseclib.sourceforge.net](http://phpseclib.sourceforge.net/pear.htm)