Hi, first time posting, really would appreciate help. Comcast 1Gig service worked from December 2017 until about 2 mos ago. 3 pcs all running Win 10 Pro affected. Problems exists in Firexfox, IE, Edge and Chrome! Output of Arris SB8200 modem tests indicate 1.1Gb/sec on Comcast test rig running Safarai. 2 desktops are running Gigabyte boards with two different LAN cards. 3rd pc is a Toshiba laptop with a different LAN card. All ethernet connections are CAT6 cabling.All 3 pcs running Win 10 direct connect to modem test (Ookla) at 200 - 300 Mb/s. All 3 pcs booting to Linux test at about 980 Mb/sec behind router and switch! Definitely appears to be a Windows issue and so far Microsoft has not come up with a solution. ALL tweaks suggested on Internet have been tried. Msft also did a new install of the October Windows Update in case that had somehow created a problem. I am pasting the results of the SC TCP/IP Analyzer and some system info below. Any help will be greatly appreciated! SG TCP/IP Analyzer IP Address: 220.127.116.11 (c-75-67-252-127.hsd1.nh.comcast.net) Client OS: Windows 10 Browser: Firefox 66.0 User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:66.0) Gecko/20100101 Firefox/66.0 Please Read the Analyzer FAQ if the above is not your IP address. TCP options string = 020405b401010402 MTU = 1500 MTU is fully optimized for broadband. MSS = 1460 Maximum useful data in each packet = 1460, which equals MSS. Default TCP Receive Window (RWIN) = 64240 RWIN Scaling (RFC1323) = 0 bits Unscaled TCP Receive Window = 64240 In Windows 10, unless "TCP/IP Auto-Tuning" is disabled, only the Current TCP Window is displayed. Use the latest TCP Optimizer for tweaking. RWIN is a multiple of MSS Other RWIN values that might work well with your current MTU/MSS: 64240 (up to 2 Mbit lines, depending on latency. MSS * 44) <-- current value 128480 (1-5 Mbit lines, depending on latency. MSS * 44 * 2) 256960 (2-15 Mbit lines, depending on latency. MSS * 44 * 2^2) 513920 (10-30 Mbit lines, depending on latency. MSS * 44 * 2^3) 1027840 (30-100 Mbit lines depending on latency. MSS * 44 * 2^4) bandwidth * delay product (Note this is not a speed test): Your current TCP Window limits you to: 2570 kbps (321 KBytes/s) @ 200ms latency Your current TCP Window limits you to: 1028 kbps (128 KBytes/s) @ 500ms latency MTU Discovery (RFC1191) = ON Time to live left = 115 hops TTL value is ok. Timestamps (RFC1323) = OFF Selective Acknowledgements (RFC2018) = ON IP type of service field (RFC1349) = 00000000 (0) ********************************************* OS Name Microsoft Windows 10 Pro Version 10.0.17763 Build 17763 Other OS Description Not Available OS Manufacturer Microsoft Corporation System Name DESKTOP-6SADFNR System Manufacturer Gigabyte Technology Co., Ltd. System Model Z97X-UD3H System Type x64-based PC System SKU To be filled by O.E.M. Processor Intel(R) Pentium(R) CPU G3258 @ 3.20GHz, 3201 Mhz, 2 Core(s), 2 Logical Processor(s) BIOS Version/Date American Megatrends Inc. F7, 6/17/2014 SMBIOS Version 2.7 Embedded Controller Version 255.255 BIOS Mode Legacy BaseBoard Manufacturer Gigabyte Technology Co., Ltd. BaseBoard Product Z97X-UD3H-CF BaseBoard Version x.x Platform Role Desktop Secure Boot State Unsupported PCR7 Configuration Binding Not Possible Windows Directory C:\WINDOWS System Directory C:\WINDOWS\system32 Boot Device \Device\HarddiskVolume1 Locale United States Hardware Abstraction Layer Version = "10.0.17763.194" User Name DESKTOP-6SADFNR\Paul Time Zone Eastern Daylight Time Installed Physical Memory (RAM) 8.00 GB Total Physical Memory 7.86 GB Available Physical Memory 5.15 GB Total Virtual Memory 9.74 GB Available Virtual Memory 7.20 GB Page File Space 1.88 GB Page File C:\pagefile.sys Kernel DMA Protection Off Virtualization-based security Not enabled Device Encryption Support Reasons for failed automatic device encryption: TPM is not usable, PCR7 binding is not supported, Hardware Security Test Interface failed and device is not InstantGo, Un-allowed DMA capable bus/device(s) detected, Disabled by policy, TPM is not usable Hyper-V - VM Monitor Mode Extensions Yes Hyper-V - Second Level Address Translation Extensions Yes Hyper-V - Virtualization Enabled in Firmware Yes Hyper-V - Data Execution Protection Yes Thank you very much inn advance for any insight and suggestions!
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