[solved] Usually showing "cannot display the web page"

redstrike

redstrike

Well-Known Member
#1
#1
Hello,

I am using LiteSpeed 4.1.4. I usually got the "cannot display the web page" after a few hit to navigate, in front-end, back-end, phpmyadmin too.

I don't know why. But server is running normally, not disk i/o, not high load, in very fast state. Although, it returns error page the database is working and update my queries.
 
Last edited by a moderator:
redstrike

redstrike

Well-Known Member
#3
#3
webizen said:
anything in the error log (e.g. /usr/local/lsws/logs/error.log)? what platform (OS version, etc) in question?
Click to expand...
Nothing special in error.log, I am using CentOS 5.6

It's seem that problems happen in peak hours. My VPS remains a lot of RAM, CPU not high load, no disk I/O.
 
S

sysmesh

Member
#5
#5
I can add that on my machine all wordpress sites give 403 errors whenever you edit a post and add ANY html valid element in them (i.e. <br> or <b></b>). It will error out on 403 upon save.

I had to roll back to 4.1.3 to solve it.
There seems to be some bug in 4.1.4 around parsing.
 
S

sip

Well-Known Member
#6
#6
I have already posted 4.1.4 ugrade resulted in 406 errors which on 4.1.3 never happened. So i have downgraded to 4.1.3. Seems 4.1.4 has some issues.

On CentOS 5.x
cPanel/WHM.

Regards
 
W

webizen

Well-Known Member
#8
#8
please post more details of 406 error if any from error log (e.g. /usr/local/apache/logs/error_log).

sip said:
I have already posted 4.1.4 ugrade resulted in 406 errors which on 4.1.3 never happened. So i have downgraded to 4.1.3. Seems 4.1.4 has some issues.

On CentOS 5.x
cPanel/WHM.

Regards
Click to expand...
 
S

sip

Well-Known Member
#9
#9
However, here's more detail (not from logs):

4.1.3 works fine on all sites (commercial cms based).
When upgraded to 4.1.4 images being posted in body of article gives rise to 406 errors and the article gets saved without the image.

As a result of this had to downgrade to 4.1.3 where everything works fine.
Pl note that there's no change in any configuration done on server (except for upgrade to 4.1.4) so there's no other variable which could be causing this as only change that happens is Upgrade to 4.1.4 from 4.1.3

Currently running 4.1.3 (downgraded from 4.1.4) with no such error.

Regards

webizen said:
please post more details of 406 error if any from error log (e.g. /usr/local/apache/logs/error_log).
Click to expand...
 
M

mistwang

LiteSpeed Staff
#10
#10
Any one can reliably reproduce this problem with 4.1.4, please contact bug@litespeed..., we need to figure out what exactly causing this problem.
 
M

mistwang

LiteSpeed Staff
#12
#12
Please do force reinstall of 4.1.4, it should be addressed now.
Scan request body is enabled by default in 4.1.4, while it was disable in Apache and earlier release of LSWS.
 
redstrike

redstrike

Well-Known Member
#13
#13
Hello, I got big problem with my site. Below is my top -c, litespeed eats up a lot of CPU. Does it because someone hotlink my large static files? I usually got "Cannot display error after a few successful hit". This is very annoy. Does my bottneck is CPU Bound?

PHP: 
top - 12:38:30 up 54 min,  1 user,  load average: 2.39, 2.24, 2.10
Tasks:  75 total,   3 running,  72 sleeping,   0 stopped,   0 zombie
Cpu(s): 16.7%us, 32.5%sy,  0.0%ni, 50.7%id,  0.0%wa,  0.0%hi,  0.0%si,  0.0%st
Mem:    786432k total,   409056k used,   377376k free,        0k buffers
Swap:   131072k total,        0k used,   131072k free,        0k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
 5171 apache     4 -19 11812 6500 1628 R 96.8  0.8  11:03.69 litespeed
 3572 root      15   0 10196 2960 2368 R  1.0  0.4   0:13.60 sshd
    1 root      15   0  2156  664  572 S  0.0  0.1   0:00.22 init
 1114 root      15  -4  2260  556  344 S  0.0  0.1   0:00.00 udevd
 1204 root      15   0 22448  568  468 S  0.0  0.1   0:00.57 brcm_iscsiuio
 1413 root      16   0  1812  572  480 S  0.0  0.1   0:00.03 syslogd
 1463 root      15   0  7204 1060  660 S  0.0  0.1   0:00.00 sshd
 1472 root      18   0  2832  864  696 S  0.0  0.1   0:00.00 xinetd
 1482 root      19   0  3708 1308 1132 S  0.0  0.2   0:00.01 mysqld_safe
 1508 root      15   0  3248  432  324 S  0.0  0.1   0:00.12 da-popb4smtp
 1543 mysql     15   0  200m  43m 3476 S  0.0  5.7   0:00.66 mysqld
 1572 ftp       15   0  2888 1068  524 S  0.0  0.1   0:00.05 proftpd
 1592 mysql     15   0  200m  43m 3476 S  0.0  5.7   0:00.08 mysqld
 1593 mysql     20   0  200m  43m 3476 S  0.0  5.7   0:00.00 mysqld
 1594 mysql     16   0  200m  43m 3476 S  0.0  5.7   0:00.00 mysqld
 1595 mysql     17   0  200m  43m 3476 S  0.0  5.7   0:00.00 mysqld
 1596 mysql     15   0  200m  43m 3476 S  0.0  5.7   0:00.07 mysqld
 1632 root      18   0  4488 1112  560 S  0.0  0.1   0:00.02 crond
 3512 xfs       18   0  3216 1000  720 S  0.0  0.1   0:00.00 xfs
 3549 root      18   0  5684  700  424 S  0.0  0.1   0:00.00 saslauthd
 3550 root      18   0  5684  440  164 S  0.0  0.1   0:00.00 saslauthd
 3559 mysql     15   0  200m  43m 3476 S  0.0  5.7   0:00.51 mysqld
 3560 mysql     15   0  200m  43m 3476 S  0.0  5.7   0:00.56 mysqld
 3561 mysql     16   0  200m  43m 3476 S  0.0  5.7   0:00.72 mysqld
 3562 mysql     15   0  200m  43m 3476 S  0.0  5.7   0:00.97 mysqld
 3564 mysql     18   0  200m  43m 3476 S  0.0  5.7   0:00.94 mysqld
 3565 mysql     15   0  200m  43m 3476 S  0.0  5.7   0:01.26 mysqld
 3566 mysql     15   0  200m  43m 3476 S  0.0  5.7   0:01.05 mysqld
 3567 mysql     15   0  200m  43m 3476 S  0.0  5.7   0:01.17 mysqld
 3568 mysql     15   0  200m  43m 3476 S  0.0  5.7   0:01.22 mysqld
 3576 mysql     15   0  200m  43m 3476 S  0.0  5.7   0:01.19 mysqld
 3579 root      20   0  2772  532  444 S  0.0  0.1   0:00.00 nc
 3580 root      20   0  2772  540  448 S  0.0  0.1   0:00.00 nc
 3584 mysql     15   0  200m  43m 3476 S  0.0  5.7   0:00.99 mysqld
 3585 mysql     15   0  200m  43m 3476 S  0.0  5.7   0:01.29 mysqld
 3586 mysql     15   0  200m  43m 3476 S  0.0  5.7   0:01.10 mysqld
 3588 mysql     15   0  200m  43m 3476 S  0.0  5.7   0:00.81 mysqld
 3590 mysql     18   0  200m  43m 3476 S  0.0  5.7   0:12.02 mysqld
 3595 mysql     17   0  200m  43m 3476 S  0.0  5.7   0:01.14 mysqld
 3597 mysql     15   0  200m  43m 3476 S  0.0  5.7   0:00.94 mysqld
 3599 mysql     18   0  200m  43m 3476 S  0.0  5.7   0:01.23 mysqld
 3611 nobody    15   0  9176 1348  940 S  0.0  0.2   0:00.12 directadmin
 3644 named     20   0 50344 3472 1904 S  0.0  0.4   0:00.03 named
 3655 mysql     15   0  200m  43m 3476 S  0.0  5.7   0:01.02 mysqld
 3656 mysql     15   0  200m  43m 3476 S  0.0  5.7   0:01.19 mysqld
 3658 mysql     15   0  200m  43m 3476 S  0.0  5.7   0:00.83 mysqld
 3660 mysql     15   0  200m  43m 3476 S  0.0  5.7   0:01.20 mysqld
 3662 mysql     15   0  200m  43m 3476 S  0.0  5.7   0:01.43 mysqld
 3664 mysql     15   0  200m  43m 3476 S  0.0  5.7   0:00.98 mysqld
 3680 mysql     16   0  200m  43m 3476 S  0.0  5.7   0:00.92 mysqld
 3683 mysql     15   0  200m  43m 3476 S  0.0  5.7   0:00.85 mysqld
 3684 mysql     15   0  200m  43m 3476 S  0.0  5.7   0:01.03 mysqld
 3685 mysql     16   0  200m  43m 3476 S  0.0  5.7   0:00.98 mysqld
 3687 mysql     16   0  200m  43m 3476 S  0.0  5.7   0:00.86 mysqld
 3689 mysql     15   0  200m  43m 3476 S  0.0  5.7   0:01.59 mysqld
 3792 nobody    15   0  9176  572  164 S  0.0  0.1   0:00.00 directadmin
 3877 nobody    15   0  9176  572  164 S  0.0  0.1   0:00.00 directadmin
 3890 nobody    15   0  9176  572  164 S  0.0  0.1   0:00.00 directadmin
 3930 nobody    15   0  9176  572  164 S  0.0  0.1   0:00.00 directadmin
 3932 nobody    15   0  9176  572  164 S  0.0  0.1   0:00.00 directadmin
 5169 root       0 -19  7328 2140 1472 S  0.0  0.3   0:00.11 litespeed
 
redstrike

redstrike

Well-Known Member
#17
#17
NiteWave said:
the picture not clear
Click to expand...
Hi NiteWave,

It seems that the bottneck is disk I/O for streaming media. And another sites are trying to use my media url for streaming on their site, although i was enable Hot-Link Prevent. But a lot of "Not Found" requests still hits server and consume some resources. So, that's why one LiteSpeed instance was overload to serve a lot of media files and handle requests which come from outside.
 
redstrike

redstrike

Well-Known Member
#19
#19
I think vmstat will be better show the case. I used the 2-CPU trial license last 2 months (that's time i didn't know about disk I/O), and i found that 2-CPU license wasn't help much in my case, on a small VPS with a limited computing power. The fact shows that, i don't usually used up max 150 connections before the disk I/O occurs.

PHP: 
[root@server ~]# vmstat 2
procs -----------memory---------- ---swap-- -----io---- --system-- -----cpu-----
-
 r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa st
 1  1      0 396148      0      0    0    0 82067 13873    0 5796  5  7 52 36  0
 0  1      0 391088      0      0    0    0   812    12    0 3552  6  1 61 31  0
 0  1      0 390188      0      0    0    0  1036    14    0 4167  5  2 59 33  0
 1  0      0 392512      0      0    0    0   990   240    0 3874  4  7 64 26  0
 0  1      0 395064      0      0    0    0   532   102    0 4299 10 17 57 16  0
 0  1      0 395064      0      0    0    0   180     2    0 3017  1  1 50 48  0
 1  0      0 395032      0      0    0    0  1048     4    0 4616 16 23 58  3  0
 1  0      0 397088      0      0    0    0   462     2    0 3432 16 30 51  3  0
 0  1      0 397120      0      0    0    0   574     2    0 2854 16 31 49  3  0
 0  1      0 397120      0      0    0    0   124     0    0 2318  0  0 50 50  0
 0  1      0 397120      0      0    0    0   126     0    0 2820  0  0 50 50  0
 0  1      0 390324      0      0    0    0   354    30    0 3564  5  9 49 37  0
 3  0      0 390300      0      0    0    0   564     4    0 4214 17 19 53 10  0
 1  0      0 392792      0      0    0    0   252     2    0 3962 13 15 55 16  0
 1  0      0 392528      0      0    0    0   630     4    0 3801 18 29 43 10  0
 0  1      0 395060      0      0    0    0   128     2    0 4199 11 17 49 23  0
 0  1      0 400608      0      0    0    0   376     0    0 3934  7 10 55 28  0
 1  0      0 400880      0      0    0    0   508   230    0 5083 11 20 46 22  0
 0  1      0 400880      0      0    0    0   638    96    0 3117 11 25 48 16  0
 1  0      0 400832      0      0    0    0   678     4    0 3639 14 21 46 19  0
 1  0      0 400816      0      0    0    0   364     2    0 3876 15 29 49  7  0
 1  0      0 400912      0      0    0    0   576     4    0 3413  7 14 49 30  0
 1  0      0 400912      0      0    0    0   650     2    0 3566 15 32 49  4  0
 1  0      0 400636      0      0    0    0   106     2    0 3371 13 23 43 20  0
 0  1      0 400636      0      0    0    0   284     0    0 3471  3  6 49 42  0
 0  1      0 400068      0      0    0    0   626     6    0 4533 12 15 44 30  0
 1  0      0 400068      0      0    0    0   388     8    0 3670 13 26 57  4  0
 1  0      0 400100      0      0    0    0   602   212    0 3649 16 29 50  5  0
 2  0      0 400356      0      0    0    0   512    46    0 4242 17 27 44 12  0
 2  1      0 400356      0      0    0    0   514     4    0 4107 13 27 47 13  0
 1  0      0 400356      0      0    0    0  1020     2    0 3757 15 25 48 12  0
 0  1      0 400356      0      0    0    0   274     2    0 3537 12 27 50 11  0
 0  1      0 400356      0      0    0    0     0     0    0 3662  0  0 50 50  0
 3  0      0 400580      0      0    0    0   500     2    0 3670 11 14 39 37  0
 1  0      0 401372      0      0    0    0   456     4    0 4747 12 24 54 10  0
 1  0      0 401372      0      0    0    0   736     4    0 4539  8 16 49 27  0
 0  2      0 400860      0      0    0    0   820    28    0 3996  9 16 48 27  0
 1  0      0 400820      0      0    0    0   646     2    0 5343 13 22 42 22  0
 0  1      0 400824      0      0    0    0   164   146    0 5081  9 20 48 23  0
 2  0      0 400396      0      0    0    0   604    72    0 4614  8 11 51 30  0
 1  0      0 401104      0      0    0    0   756    58    0 2687  6 11 49 34  0
 0  1      0 400848      0      0    0    0   380   108    0 3217  7 14 47 32  0
 1  0      0 400848      0      0    0    0   592    58    0 3217  4  7 50 39  0
 0  1      0 400848      0      0    0    0   884     6    0 3152  7 13 51 29  0
 1  0      0 400844      0      0    0    0  1060     4    0 4600 14 24 52  9  0
 1  0      0 400876      0      0    0    0   636     2    0 2409 12 23 57  8  0
 0  1      0 401108      0      0    0    0   828    30    0 2704  7 11 67 15  0
 0  0      0 400836      0      0    0    0   378     2    0 3917 10 13 72  5  0
 0  1      0 400840      0      0    0    0   722     6    0 2686  5 10 61 24  0
 2  0      0 399864      0      0    0    0   908   106    0 2848  5  3 54 38  0
 0  0      0 400312      0      0    0    0   470    56    0 2514  1  2 58 39  0
 0  1      0 400336      0      0    0    0   858    60    0 2727  0  1 51 48  0
 0  1      0 399704      0      0    0    0   778    42    0 3212  1  1 62 36  0
 1  1      0 401352      0      0    0    0  1052    10    0 3638  5  5 50 41  0
 1  0      0 401352      0      0    0    0  1428     6    0 3437  6 11 64 18  0
 0  1      0 401096      0      0    0    0   828     4    0 2725  9 16 55 20  0
 3  0      0 401104      0      0    0    0  1238     6    0 3028  7 11 51 31  0
 1  0      0 400804      0      0    0    0  1174     2    0 3325  5  6 82  7  0
 0  0      0 400804      0      0    0    0   804     2    0 3869  4  7 80  8  0
 1  0      0 400780      0      0    0    0  1082     6    0 3391  7 14 60 19  0
 0  0      0 400776      0      0    0    0   818   264    0 2885  5  9 61 25  0
 0  0      0 401108      0      0    0    0   746     6    0 3629  4  8 84  5  0
 0  0      0 401108      0      0    0    0   754     0    0 3314  0  0 97  2  0
 
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