Preceding 7 Days
From 19 Jul 2026 0:00:19 to 25 Jul 2026 23:59:40
| Page | Total | | LSU | | Outside | |
AI-A, | (Bot? ) | (AI-C ) |
|---|
| /tca/papers/ vanderwiel-00.pdf | 919 | = | 0 | + | 875 | + | 44, | ( 23) | ( 3) |
| /seminar/ sem_insert_fierce.js | 547 | = | 34 | + | 513 | + | 0, | ( 133) | ( 1) |
| /lsu-cms/ ece-mc-css-main-1.js | 543 | = | 34 | + | 509 | + | 0, | ( 139) | ( 1) |
| /kak/ EarlyArchitecture.pdf | 292 | = | 0 | + | 291 | + | 1, | ( 5) | ( 3) |
| /kak/ MahabharataII.pdf | 249 | = | 0 | + | 195 | + | 54, | ( 51) | ( 5) |
| /mendrela/ EE3410ElMechEnergyConv.pdf | 238 | = | 0 | + | 231 | + | 7, | ( 7) | ( 2) |
| /kak/ GarbhaUpanishad.pdf | 229 | = | 0 | + | 205 | + | 24, | ( 14) | ( 6) |
| /fac/ faculty-az-insert-fierce.js | 155 | = | 17 | + | 138 | + | 0, | ( 32) | ( 0) |
| /alex/EE3755/fall09/Cadence_Verilog.pdf | 129 | = | 0 | + | 116 | + | 13, | ( 4) | ( 0) |
| /kak/ vena.pdf | 118 | = | 0 | + | 114 | + | 4, | ( 12) | ( 1) |
| /gp/refs/NVIDIA-Turing-Architecture-Whitepaper.pdf | 105 | = | 0 | + | 90 | + | 15, | ( 25) | ( 3) |
| /kak/ zoro.pdf | 102 | = | 0 | + | 75 | + | 27, | ( 14) | ( 3) |
| /mcu/lawss/add_materials/FaultDetectionPart1.pdf | 100 | = | 0 | + | 30 | + | 70, | ( 25) | ( 3) |
| /gunturk/Topics/ Segmentation-1.pdf | 87 | = | 0 | + | 80 | + | 7, | ( 10) | ( 0) |
| /kak/ a3.pdf | 82 | = | 0 | + | 75 | + | 7, | ( 8) | ( 3) |
| /gp/refs/ GLSLangSpec.4.60.pdf | 80 | = | 0 | + | 48 | + | 32, | ( 17) | ( 5) |
| /kemin/Chapter1_files/* | 79 | = | 0 | + | 78 | + | 1, | ( 10) | ( 0) |
| /lsu-cms/ ece-mc-lab-index.js | 79 | = | 0 | + | 79 | + | 0, | ( 19) | ( 0) |
| /gp/notes/ set-nv-org.pdf | 77 | = | 0 | + | 53 | + | 24, | ( 18) | ( 6) |
| /kak/ AryabhataAlgorithm.pdf | 77 | = | 0 | + | 75 | + | 2, | ( 11) | ( 3) |
| /lpeng/papers/ tpds-20-1.pdf | 71 | = | 0 | + | 65 | + | 6, | ( 7) | ( 0) |
| /gp/refs/ gf100-whitepaper.pdf | 70 | = | 0 | + | 51 | + | 19, | ( 5) | ( 3) |
| /kak/ ast.pdf | 69 | = | 0 | + | 56 | + | 13, | ( 18) | ( 5) |
| /lsu-cms/ ece-mc-css-misc.js | 69 | = | 1 | + | 68 | + | 0, | ( 29) | ( 0) |
| / xinli | 67 | = | 0 | + | 60 | + | 7, | ( 15) | ( 0) |
| /jxr/ pluto | 65 | = | 0 | + | 35 | + | 30, | ( 11) | ( 0) |
| /mcu/lawss/add_materials/FaultDetectionPart3.pdf | 64 | = | 0 | + | 21 | + | 43, | ( 11) | ( 1) |
| /kak/ taj.pdf | 62 | = | 0 | + | 53 | + | 9, | ( 7) | ( 3) |
| /kemin/ robust.htm | 62 | = | 0 | + | 32 | + | 30, | ( 7) | ( 1) |
| / ram | 62 | = | 2 | + | 59 | + | 1, | ( 19) | ( 3) |
| /ee4720/doc/ itanium-arch-2.1-v3.pdf | 59 | = | 0 | + | 51 | + | 8, | ( 11) | ( 0) |
| /kak/ ang3.pdf | 58 | = | 0 | + | 51 | + | 7, | ( 31) | ( 3) |
| /lsu-cms/ ece-mc-labs.js | 56 | = | 0 | + | 56 | + | 0, | ( 19) | ( 0) |
| /kak/ Time2.pdf | 54 | = | 0 | + | 50 | + | 4, | ( 19) | ( 5) |
| /kak/ VedicJapan.pdf | 54 | = | 0 | + | 54 | + | 0, | ( 19) | ( 2) |
| / koppel | 54 | = | 1 | + | 49 | + | 4, | ( 21) | ( 1) |
| /hpca-18/files/ submission.htm | 52 | = | 0 | + | 6 | + | 46, | ( 3) | ( 1) |
| /ee4720/doc/ riscv-bitmanip-1.0.0.pdf | 51 | = | 0 | + | 27 | + | 24, | ( 11) | ( 0) |
| /kak/ roopa51.pdf | 50 | = | 0 | + | 38 | + | 12, | ( 20) | ( 4) |
| /kak/ shiva.pdf | 49 | = | 0 | + | 38 | + | 11, | ( 12) | ( 4) |
| /gunturk/Topics/ Demosaicking-1.pdf | 48 | = | 0 | + | 24 | + | 24, | ( 9) | ( 3) |
| /kak/ IndusFreqAnalysis.pdf | 48 | = | 0 | + | 34 | + | 14, | ( 12) | ( 2) |
| /ee4720/doc/ mips32-r6-2a.pdf | 45 | = | 0 | + | 13 | + | 32, | ( 9) | ( 1) |
| /ipl/papers/ IEEE_SPM2005.pdf | 45 | = | 0 | + | 26 | + | 19, | ( 21) | ( 4) |
| /kak/ bhate.pdf | 43 | = | 0 | + | 32 | + | 11, | ( 48) | ( 0) |
| /koppel/gpup/ sys-status.html | 42 | = | 14 | + | 28 | + | 0, | ( 0) | ( 1) |
| /gunturk/EE7700/ CSS.pdf | 41 | = | 0 | + | 23 | + | 18, | ( 13) | ( 0) |
| /lpeng/papers/ isast08.pdf | 41 | = | 0 | + | 31 | + | 10, | ( 12) | ( 3) |
| /ee4720/doc/ vax-11780-arch-handbook.pdf | 40 | = | 0 | + | 33 | + | 7, | ( 9) | ( 5) |
| /seminar/ index-insert.js | 40 | = | 0 | + | 40 | + | 0, | ( 15) | ( 0) |
| Totals: | 20482 | | 396 | | 20086 | |
1862, | (12582 ) | 2346, |
|---|
| Distinct Hosts: | 0 | | 0 | | 0 | |
-1, | (2902 ) | ( -1 ) |
|---|
A category is chosen using these tests applied in order:
"Bot?", Hit from the same host requested robots.txt. (As Web indexers do.)
"LSU", Host name matches Perl regular expression \.lsu\.edu$.
"Outside", Any host name.
|
Browsers and other User Agents |
All Brwsrs Brand : Version Pct, ...
59.65% 79.23% Chrome : 142.0.x 15.5%, 137.0.0.0 10.6%, 150.0.x 10.0%,
: 146.0.x 5.9%, 148.0.x 5.2%, 133.0.x 1.9%,
: 135.0.x 1.9%, 136.0.0.0 1.9%, 122.0x 1.7%,
: 149.0.x 1.5%, 144.0.0.0 1.5%.
: Android 17.8%, Linux 3.0%, Macintosh 33.7%,
: Unknown 1.3%, Windows 38.7%, iPhone 5.5%.
8.59% 11.40% Safari : 605.1.15x 37.9%, 537.36 34.8%, 604.1x 22.5%,
: 601.2.4 facebookexternalhit/1.1 Facebot Twitterbot/1.0 2.0%,
: 10600.6.3 1.3%, 601.1 0.4%, 416.12 0.2%,
: 125.12 0.1%, 125.8 0.1%, 533.16 0.1%,
: 534.43.3 0.1%.
: Android 31.1%, Macintosh 40.6%, Unknown 4.3%,
: Windows 1.0%, iPad 1.0%, iPhone 21.8%,
: iPod 0.2%.
8.13% ChatGPT-User
3.84% focused-img2dataset-pdf/1.0
3.56% 4.73% Netscape : 5.0 AppleWebKit/537.36 94.5%, 5.0 5.4%,
: 5.0 AlvinResearchCrawler/1.0 0.1%.
: Linux 0.1%, Unknown 99.7%, Windows 0.1%.
3.38% 4.49% Firefox : 152.0 16.1%, 115.0 13.2%, 135.0 12.0%,
: 133.0 9.8%, 147.0 9.8%, 144.0 9.0%,
: 155.0 6.1%, 153.0 5.3%, 111.0 5.3%,
: 140.0 2.1%, 125.0 1.3%.
: Android 2.2%, Linux 17.5%, Macintosh 50.0%,
: Windows 30.3%.
2.78% axios/1.17.0
1.85% YisouSpider
1.31% ComplianceSearchTool/1.0
0.96% Python : 3.12 aiohttp/3.12.12 98.6%,
: 3.10 aiohttp/3.1x 1.4%.
: Unknown 100.0%.
Notes: MSIE refers to Microsoft Internet Explorer, Netscape refers
to Netscape Navigator, SeaMonkey refers to SeaMonkey and to older
versions (called the Mozilla Suite). Firefox
refers to Mozilla Firefox and to older versions (Mozilla Firebird,
Firebird™ and Phoenix). All shows the percentage of
accesses using the corresponding user agent, Brwsrs only counts
recognized web browsers. A version ending in x refers to
multiple sub-versions.
|
Accesses by Possible Crawlers |
Visits Crawler
2775 Googlebot
1317 petalsearch.com
1208 ClaudeBot
1173 bingbot
813 apple.com
719 Amazonbot
448 ap-southeast-1.com
|
Most Frequently Visiting Domains |
Visits Hosts Originating Domain
1403 1 48.204.76
995 225 amazonaws.com
851 122 your-server.de
724 1 74.7.241
356 259 apple.com
293 1 highland.net
276 86 20.169.78
243 168 sogou.com
212 1 mikegpts-XXX.lsu.edu
165 53 sbcglobal.net
154 121 googlezip.net
150 120 baidu.com
149 148 sprious.com
141 15 ece.lsu.edu
138 2 160.211.67
|
Most Frequently Visiting Countries or Groups |
Visits Hosts Originating Country or Group
14161 8566 Unknown Origin
2776 1546 com - Commercial
1622 981 net - Network Provider
964 223 de - Germany
662 653 br - Brazil
413 46 edu - Educational
205 205 mx - Mexico
108 107 ar - Argentina
99 98 co - Colombia
77 75 fr - France
68 67 cl - Chile
61 53 cn - People's Republic of China
57 57 es - Spain
55 54 it - Italy
53 53 ec - Ecuador
Omitted promotional referrers: 350, promoted urls: 50.
|
Most Frequently Used Search Engines |
Visits Via Search Engine
9 www.google.com
2 scholar.google.com
1 cn.bing.com
|
Most Frequently Used Search Strings |
#e #s #p Visits Using Search Strings... ...Found Page (Most Visits)
1 1 1 4 https://www.ece.lsu.edu/kak/GarbhaUpanishad.pdf/kak/GarbhaUpanishad.pdf
1 1 1 1 A theory of multiscale, curvature-based shape representation for planar curve/gunturk/EE7700/Mokhtarian1.pdf
1 1 1 1 A Theory of Multiscale, Curvature-Based Shape Representation for Planar Curves Farzin Mokhtarian and Alan K. Mackworth/gunturk/EE7700/Mokhtarian1.pdf
1 1 1 1 Demosaicking: Color Filter Array Interpolation/gunturk/EE7700/CFAinterpolation.pdf
1 1 1 1 https://www.ece.lsu.edu/gunturk/EE7700/Eigenface.pdf/gunturk/EE7700/Eigenface.pdf
1 1 1 1 https://www.ece.lsu.edu/kak/KAKThePaninianApproach.pdf/kak/KAKThePaninianApproach.pdf
1 1 1 1 https://www.ece.lsu.edu/kak/shiva.pdf /kak/shiva.pdf
1 1 1 1 https://www.ece.lsu.edu/mcanelly/index.html/mcanelly/index.html
1 1 1 1 https://www.ece.lsu.edu/smehraeen/ /smehraeen
#e: Number of different search engines used, link is to the most
common engine.
#s: Number of search strings the line actually reports
on. For example, if the #s entry were 5 and the string shown were "Computers"
the line might report on search strings "Computers", "Computer", "+Computers",
"COMPUTERS", and even "-computers".
#p: Number of distinct pages that
were visited, the one with the most visits from
the string is shown.
From 19 Jul 2026 2:04:59 to 25 Jul 2026 23:16:02
| Page | Total | | LSU | | Outside | |
AI-A, | (Bot? ) | (AI-C ) |
|---|
| /gp/srefs/ p830-villa.pdf | 11 | = | 0 | + | 11 | + | 0, | ( 2) | ( 0) |
| /jxr/7000/ stuff | 7 | = | 0 | + | 7 | + | 0, | ( 0) | ( 0) |
| /gp/srefs/ R5xx_Acceleration_v1.2.pdf | 6 | = | 0 | + | 6 | + | 0, | ( 0) | ( 0) |
| /koppel/gp/srefs/montrym-05-micro-gf6800.pdf | 6 | = | 1 | + | 5 | + | 0, | ( 0) | ( 0) |
| /tca/s/ reinman-01.pdf | 6 | = | 0 | + | 6 | + | 0, | ( 2) | ( 0) |
| /v/ leo_user.pdf | 6 | = | 0 | + | 6 | + | 0, | ( 0) | ( 0) |
| /v/s/ genus_attref.pdf | 6 | = | 0 | + | 6 | + | 0, | ( 0) | ( 0) |
| /jxr/courses/7700-dsparch/stuff | 5 | = | 0 | + | 5 | + | 0, | ( 0) | ( 0) |
| Totals: | 238 | | 1 | | 237 | |
2, | ( 50 ) | 1, |
|---|
| Distinct Hosts: | 0 | | 0 | | 0 | |
-1, | ( 29 ) | ( -1 ) |
|---|
A category is chosen using these tests applied in order:
"Bot?", Hit from the same host requested robots.txt. (As Web indexers do.)
"LSU", Host name matches Perl regular expression \.lsu\.edu$.
"Outside", Any host name.
|
Browsers and other User Agents |
All Brwsrs Brand : Version Pct, ...
92.08% 93.64% Chrome : 144.0.0.0 16.7%, 146.0.0.0 12.7%,
: 137.0.0.0 9.5%, 148.0.0.0 7.2%,
: 122.0.0.0 7.2%, 47.0.x 3.6%, 54.0.x 3.2%,
: 51.0.x 3.2%, 45.0.x 2.7%, 52.0.x 2.7%,
: 46.0.x 2.3%.
: Android 31.7%, Linux 0.9%, Macintosh 21.7%,
: Windows 33.9%, iPhone 11.8%.
4.17% 4.24% Safari : 604.1 60.0%, 605.1.15 40.0%.
: Macintosh 40.0%, iPhone 60.0%.
2.08% 2.12% Firefox : 147.0 60.0%, 135.0 20.0%, 133.0 20.0%.
: Macintosh 100.0%.
0.83% Sogou web spider/4.0
0.83% ChatGPT-User
Notes: MSIE refers to Microsoft Internet Explorer, Netscape refers
to Netscape Navigator, SeaMonkey refers to SeaMonkey and to older
versions (called the Mozilla Suite). Firefox
refers to Mozilla Firefox and to older versions (Mozilla Firebird,
Firebird™ and Phoenix). All shows the percentage of
accesses using the corresponding user agent, Brwsrs only counts
recognized web browsers. A version ending in x refers to
multiple sub-versions.
|
Most Frequently Visiting Domains |
Denys Hosts Originating Domain
39 36 sogou.com
21 1 48.204.76
10 6 113.217.243
6 4 61.250.32
6 1 45.24.248
4 4 ttnet.com.tr
4 4 megared.net.mx
3 3 prod-infinitum.com.mx
3 3 sbcglobal.net
3 3 hinet.net
|
Most Frequently Visiting Countries or Groups |
Denys Hosts Originating Country or Group
125 94 Unknown Origin
40 37 com - Commercial
19 19 net - Network Provider
17 17 br - Brazil
9 9 mx - Mexico
4 4 tr - Turkey
2 2 au - Australia
2 2 cl - Chile
2 2 pl - Poland
2 2 co - Colombia
|
Most Frequently Likely Referring Hosts |
Lnks Denys ...From Links on Host Most Common Linking Page and Target
2 8 www.ece.lsu.edu 6 From → /gp/srefs/R5xx_Acceleration_v1.2.pdf
Omitted promotional referrers: 0 promoted urls: 0
|
Most Frequently Used Search Strings |
#e #s #p Denys Using Search Strings... ...Found Page (Most Denys)
Status Codes (Access Outcomes)
Count Code Description
290 401 Unauthorized.
From 19 Jul 2026 0:00:13 to 25 Jul 2026 23:54:23
| Page | Total | | LSU | | Outside | |
AI-A, | (Bot? ) | (AI-C ) |
|---|
| / sitemap.xml | 318 | = | 0 | + | 318 | + | 0, | ( 29) | ( 6) |
| /wp-admin/ admin-ajax.php | 279 | = | 0 | + | 279 | + | 0, | ( 1) | ( 0) |
| / wp-login.php | 205 | = | 0 | + | 205 | + | 0, | ( 9) | ( 0) |
| / administrator | 183 | = | 0 | + | 183 | + | 0, | ( 3) | ( 0) |
| / www.ece.lsu.edu | 134 | = | 0 | + | 134 | + | 0, | ( 54) | ( 0) |
| /phpBB2/ viewtopic.php | 66 | = | 0 | + | 66 | + | 0, | ( 6) | ( 0) |
| /.well-known/ traffic-advice | 61 | = | 0 | + | 61 | + | 0, | ( 13) | ( 0) |
| /eng/research/ index.php | 47 | = | 0 | + | 47 | + | 0, | ( 3) | ( 0) |
| /eng/current/ index.php | 46 | = | 0 | + | 46 | + | 0, | ( 0) | ( 0) |
| /eng/about/ pftselfguidedtour.php | 45 | = | 0 | + | 45 | + | 0, | ( 2) | ( 0) |
| /eng/current/resources/scholarships.php | 45 | = | 0 | + | 45 | + | 0, | ( 1) | ( 0) |
| /eng/parents/ index.php | 45 | = | 0 | + | 45 | + | 0, | ( 3) | ( 0) |
| /eng/about/ dean.php | 44 | = | 0 | + | 44 | + | 0, | ( 0) | ( 0) |
| /eng/about/ engaccreditation.php | 44 | = | 0 | + | 44 | + | 0, | ( 1) | ( 0) |
| /eng/ece/ index.php | 44 | = | 0 | + | 44 | + | 0, | ( 0) | ( 0) |
| /a-z/ index.php | 43 | = | 0 | + | 43 | + | 0, | ( 2) | ( 0) |
| /eng/about/ leadershipteam.php | 43 | = | 0 | + | 43 | + | 0, | ( 1) | ( 0) |
| /eng/academics/graduate-programs/index.php | 43 | = | 0 | + | 43 | + | 0, | ( 0) | ( 0) |
| /eng/alumni/ index.php | 43 | = | 0 | + | 43 | + | 0, | ( 0) | ( 0) |
| /eng/current/advising/index.php | 43 | = | 0 | + | 43 | + | 0, | ( 1) | ( 0) |
| Totals: | 9468 | | 0 | | 9468 | |
25, | (23142 ) | 114, |
|---|
| Distinct Hosts: | 0 | | 0 | | 0 | |
-1, | ( 312 ) | ( -1 ) |
|---|
A category is chosen using these tests applied in order:
"Bot?", Hit from the same host requested robots.txt. (As Web indexers do.)
"LSU", Host name matches Perl regular expression \.lsu\.edu$.
"Outside", Any host name.
|
Browsers and other User Agents |
All Brwsrs Brand : Version Pct, ...
57.31% 70.36% Chrome : 148.0.0.0 44.2%, 120.0.x 9.9%,
: 62.0.3202.94 8.2%, 136.0.0.0 4.9%,
: 146.0.0.0 3.1%, 144.0.0.0 3.0%,
: 133.0.0.0 2.9%, 131.0.0.0 2.6%,
: 107.0.0.0 2.1%, 142.0.x 2.1%, 145.0.0.0 1.7%.
: Android 1.5%, Linux 2.5%, Macintosh 15.3%,
: Unknown 1.2%, Windows 79.0%, iPhone 0.5%.
13.91% 17.07% Netscape : 5.0 68.8%, 5.0 AppleWebKit/537.36 28.9%,
: 5.0 zgrab/0.x 2.4%.
: Unknown 100.0%.
7.71% 9.46% Firefox : 111.0 11.8%, 144.0 10.4%, 147.0 9.7%,
: 133.0 8.8%, 121.0 8.3%, 118.0.2 8.1%,
: 119.0.1 7.4%, 135.0 6.9%, 122.0 6.7%,
: 120.0.1 6.2%, 128.0 2.8%.
: Android 0.2%, Linux 15.5%, Macintosh 52.3%,
: Windows 32.0%.
4.86% Sogou web spider/4.0
4.55% CoreScrapeCourseWeb/0.1
3.75% Python/3.14 aiohttp/3.14.1
2.15% 2.64% Safari : 605.1.15 70.9%, 604.1 20.9%, 537.36 5.1%,
: 8536.25 MttCustomUA/2 QBWebViewType/1 WKType/1 0.6%,
: 534.30 0.6%, 534.53.10 0.6%, 535.8.6 0.6%,
: 6532.22.6 0.6%.
: Android 5.7%, Macintosh 72.8%, iPhone 20.9%,
: iPod 0.6%.
0.97% manager
0.83% Chrome Privacy Preserving Prefetch Proxy
0.59% uk-nhs-data/0.0
Notes: MSIE refers to Microsoft Internet Explorer, Netscape refers
to Netscape Navigator, SeaMonkey refers to SeaMonkey and to older
versions (called the Mozilla Suite). Firefox
refers to Mozilla Firefox and to older versions (Mozilla Firebird,
Firebird™ and Phoenix). All shows the percentage of
accesses using the corresponding user agent, Brwsrs only counts
recognized web browsers. A version ending in x refers to
multiple sub-versions.
|
Most Frequently Visiting Domains |
Misses Hosts Originating Domain
1537 1 172.196.45
453 202 sogou.com
446 2 34.34.229
317 1 5.253.84
313 1 78.142.18
278 1 74.7.241
248 20 googleusercontent.com
218 1 160.211.69
163 1 20.206.105
158 1 20.63.63
|
Most Frequently Visiting Countries or Groups |
Misses Hosts Originating Country or Group
7641 1872 Unknown Origin
1247 514 com - Commercial
137 112 net - Network Provider
88 87 br - Brazil
39 8 org - Non-commercial, non-governmental organization
38 38 mx - Mexico
30 10 bd - Bangladesh
24 5 tech
22 20 cn - People's Republic of China
19 10 arpa
|
Most Frequently Likely Referring Hosts |
Lnks Misses ...From Links on Host Most Common Linking Page and Target
217 1192 www.ece.lsu.edu 345 From → /eng/about/council.php
1 10 faculty.csu.edu.cn All From → /gveronis/edu/gveronis
1 1 www.facebook.com All From → /wp-login.php
Omitted promotional referrers: 256 promoted urls: 32
|
Most Frequently Used Search Strings |
#e #s #p Misses Using Search Strings... ...Found Page (Most Misses)
1 1 1 2 Set-Cookie content /eng/ece
1 1 1 1 A Theory of Multiscale, Curvature-Based Shape Representation for Planar Curves Farzin Mokhtarian and Alan K. Mackworth/gunturk/EE7700/Mokhtarian1.pdf
#e: Number of different search engines used, link is to the most
common engine.
#s: Number of search strings the line actually reports
on. For example, if the #s entry were 5 and the string shown were "Computers"
the line might report on search strings "Computers", "Computer", "+Computers",
"COMPUTERS", and even "-computers".
#p: Number of distinct pages that
were missed, the one with the most misses from
the string is shown.
Status Codes (Access Outcomes)
Count Code Description
636 400 Syntax error in request.
1211 403 Forbidden.
30746 404 Not found.
1 408 Request timeout.
3 416 Range not satisfiable.
38 500 Server error.